Supplemental Guarantor Information (Details 3) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 26,457,000us-gaap_ProfitLoss	$ 23,527,000us-gaap_ProfitLoss
Other comprehensive income, net:
Amortization of actuarial loss on defined benefit pension plan, net	68,000	5,000
Unrealized (loss) gain on marketable securities, available-for-sale, net	(19,000)	188,000
Other comprehensive income, net	49,000	193,000
Comprehensive income	26,506,000	23,720,000
CONSOLIDATING ELIMINATIONS
CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net income	(14,515,000)	(9,823,000)
Other comprehensive income, net:
Amortization of actuarial loss on defined benefit pension plan, net	0
Unrealized (loss) gain on marketable securities, available-for-sale, net	0
Other comprehensive income, net	0
Comprehensive income	(14,515,000)	(9,823,000)
TRG, INC. \| Reportable legal entities
CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net income	26,457,000	23,527,000
Other comprehensive income, net:
Amortization of actuarial loss on defined benefit pension plan, net	47,000	5,000
Unrealized (loss) gain on marketable securities, available-for-sale, net	(19,000)	188,000
Other comprehensive income, net	28,000	193,000
Comprehensive income	26,485,000	23,720,000
GUARANTOR SUBSIDIARIES \| Reportable legal entities
CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net income	11,237,000	10,693,000
Other comprehensive income, net:
Amortization of actuarial loss on defined benefit pension plan, net	16,000
Unrealized (loss) gain on marketable securities, available-for-sale, net	0
Other comprehensive income, net	16,000
Comprehensive income	11,253,000	10,693,000
NON-GUARANTOR SUBSIDIARIES \| Reportable legal entities
CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME
Net income	3,278,000	(870,000)
Other comprehensive income, net:
Amortization of actuarial loss on defined benefit pension plan, net	5,000
Unrealized (loss) gain on marketable securities, available-for-sale, net	0
Other comprehensive income, net	5,000
Comprehensive income	$ 3,283,000	$ (870,000)

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