Quarterly report pursuant to Section 13 or 15(d)

Short-Term Revolving Lines of Credit (Details)

v2.4.1.9
Short-Term Revolving Lines of Credit (Details)
Mar. 31, 2014
Netherlands
USD ($)
Dec. 31, 2014
India
USD ($)
Mar. 31, 2014
India
USD ($)
Dec. 31, 2014
Australia
USD ($)
Mar. 31, 2014
Australia
USD ($)
Dec. 31, 2014
Japan
USD ($)
Mar. 31, 2014
Japan
USD ($)
Dec. 31, 2014
Revolving credit facility
USD ($)
Mar. 31, 2014
Revolving credit facility
USD ($)
Dec. 31, 2014
Revolving credit facility
Netherlands
USD ($)
Dec. 31, 2014
Revolving credit facility
India
USD ($)
Dec. 31, 2014
Revolving credit facility
Australia
USD ($)
Dec. 31, 2014
Revolving credit facility
Japan
USD ($)
Dec. 31, 2014
Euro Member Countries, Euro
Revolving credit facility
Netherlands
EUR (€)
Dec. 31, 2014
India, Rupees
Revolving credit facility
India
INR
Dec. 31, 2014
Australia, Dollars
Revolving credit facility
Australia
AUD
Dec. 31, 2014
Japan, Yen
Revolving credit facility
Japan
JPY (¥)
Short-Term Revolving Lines of Credit                                  
Maximum borrowing capacity                   $ 4,862,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_NL
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 1,263,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_IN
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 265,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_AU
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 375,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_JP
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
€ 4,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_NL
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_EUR
80,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_IN
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_INR
325,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_AU
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_AUD
¥ 45,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ thr_CountryAxis
= country_JP
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_CurrencyAxis
= currency_JPY
Outstanding borrowings $ 0us-gaap_LinesOfCreditCurrent
/ thr_CountryAxis
= country_NL
$ 0us-gaap_LinesOfCreditCurrent
/ thr_CountryAxis
= country_IN
$ 0us-gaap_LinesOfCreditCurrent
/ thr_CountryAxis
= country_IN
$ 0us-gaap_LinesOfCreditCurrent
/ thr_CountryAxis
= country_AU
$ 0us-gaap_LinesOfCreditCurrent
/ thr_CountryAxis
= country_AU
$ 0us-gaap_LinesOfCreditCurrent
/ thr_CountryAxis
= country_JP
$ 0us-gaap_LinesOfCreditCurrent
/ thr_CountryAxis
= country_JP
$ 0us-gaap_LinesOfCreditCurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
$ 0us-gaap_LinesOfCreditCurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember