Annual report pursuant to Section 13 and 15(d)

Acquisition, Goodwill and Other Intangible Assets - Narrative (Details)

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Acquisition, Goodwill and Other Intangible Assets - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2015
Apr. 01, 2015
Mar. 02, 2015
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Dec. 31, 2015
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]                                
Goodwill       $ 122,521,000       $ 121,510,000           $ 122,521,000 $ 121,510,000  
Accrued employee compensation related to acquisition       0       5,775,000           0 5,775,000  
Purchase price net of cash received                           0 31,180,000 $ 3,890,000
Goodwill impairment                           0 1,240,000 0
Amortization of intangible assets                           $ 11,772,000 12,112,000 10,775,000
Restructuring Charges                         $ 578,000      
Decrease in revenue (percent)                           (27.00%)    
Net carrying amount       86,178,000       103,998,000           $ 86,178,000 103,998,000  
Revenues       67,582,000 $ 64,340,000 $ 68,812,000 $ 63,396,000 72,344,000 $ 74,427,000 $ 69,934,000 $ 65,223,000          
Finite-Lived Intangible Assets, Net       43,410,000                   $ 43,410,000    
CHS Transactions                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Weighted average useful life of intangible assets                           10 years    
CHS Transactions | Developed Technology Rights                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           20 years    
CHS Transactions | Customer relationships                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           10 years    
CHS Transactions | Other Intangible Assets                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           6 years    
Industrial Process Insulators, Inc.                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Trademarks carrying amount       1,820,000                   $ 1,820,000    
Business acquisition, voting interest acquired (percentage) 100.00%                              
Consideration to or on behalf of sellers at close $ 21,750,000                              
Acquiree subcontractor period (years) 17 years                              
Goodwill $ 13,249,000     10,204,000                   10,204,000    
Revenue of Acquiree since acquisition date                           12,896,000 8,863,000,000  
Gain (loss) of Acquiree since acquisition date                           $ 779,000,000 0  
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized                             33,000  
Weighted average useful life of intangible assets                           7 years 2 months 12 days    
Amount of purchase price held in escrow       4,005,000                   $ 4,005,000    
Net carrying amount       6,520,000       12,301,000           $ 6,520,000 12,301,000  
Industrial Process Insulators, Inc. | Customer relationships                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           8 years    
Net carrying amount       4,720,000       10,005,000           $ 4,720,000 10,005,000  
Industrial Process Insulators, Inc. | Other Intangible Assets                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           3 years    
Net carrying amount       359,000       628,000           $ 359,000 628,000  
Sumac                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Business acquisition, voting interest acquired (percentage)   75.00%                            
Consideration to or on behalf of sellers at close   $ 10,956,000                            
Goodwill   7,992,000                            
Revenue of Acquiree since acquisition date                           6,805,000 11,710,000  
Gain (loss) of Acquiree since acquisition date                           $ 1,892,000 4,000  
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized                               134,000
Weighted average useful life of intangible assets                           3 years 7 months 18 days    
Amount of purchase price held in escrow       536,000                   $ 536,000    
Payments to acquire businesses   10,956,000                            
Debt instrument, face amount   5,905,000                            
Net carrying amount       1,276,000       2,056,000           $ 1,276,000 2,056,000  
Sumac | Customer relationships                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           4 years    
Net carrying amount       1,276,000       1,959,000           $ 1,276,000 1,959,000  
Sumac | Other Intangible Assets                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           2 years    
Net carrying amount       0       97,000           $ 0 97,000  
Unitemp                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Trademarks carrying amount       419,000                   $ 419,000    
Business Acquisition, Transaction Costs                               $ 34,000
Consideration to or on behalf of sellers at close     $ 3,890,000                          
Goodwill     1,630,000                          
Weighted average useful life of intangible assets                           7 years 1 month    
Purchase price net of cash received     $ 3,890,000                          
Net carrying amount       306,000       343,000           $ 306,000 343,000  
Unitemp | Developed Technology Rights                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Amortization period                           3 years    
Net carrying amount       29,000       55,000           $ 29,000 55,000  
CHS Transactions                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Net carrying amount       86,178,000       103,998,000           86,178,000 103,998,000  
CHS Transactions | Developed Technology Rights                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Finite-Lived Intangible Assets, Net       6,342,000       6,962,000           6,342,000 6,962,000  
CHS Transactions | Customer relationships                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Finite-Lived Intangible Assets, Net       34,994,000       50,807,000           34,994,000 50,807,000  
CHS Transactions | Other Intangible Assets                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Finite-Lived Intangible Assets, Net       358,000       $ 783,000           358,000 783,000  
Canada, Dollars | Minimum [Member] | Sumac                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Debt instrument, maturity payment amount   0                            
Canada, Dollars | Maximum [Member] | Sumac                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Debt instrument, maturity payment amount   $ 7,500,000                            
CANADA                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Restructuring and Related Cost, Number of Positions Eliminated, Period Percent                       34.00%        
CANADA | Sumac                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Goodwill       7,611,000                   7,611,000    
CANADA | CHS Transactions                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Goodwill       35,833,000                   35,833,000    
Net carrying amount       $ 22,571,000                   $ 22,571,000    
Unitemp                                
Acquired Finite-Lived Intangible Assets [Line Items]                                
Goodwill impairment (percent)                           100.00%    
Revenues                           $ 3,916,000 5,456,000  
Results of Operations, Income before Income Taxes                           $ 672,000,000 $ 2,221,000,000