Supplemental Guarantor Information (Details 4) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011		Dec. 31, 2010		Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010		Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income from continuing operations	$ 1,263,000		$ (3,890,000)	$ (9,801,000)	$ (17,439,000)		$ (16,790,000)		$ (28,997,000)	$ (21,395,000)	$ (13,510,000)		$ (29,867,000)		$ (80,692,000)		$ (143,345,000)
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													58,012,000		118,724,000		211,148,000
Changes in assets and liabilities													(184,825,000)		(105,107,000)		220,456,000
Other operating activities, net													(988,000)		(457,000)		(10,330,000)
Net cash (used for) provided by operating activities from continuing operations													(157,668,000)		(67,532,000)		277,929,000
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													1,955,000		(4,043,000)		11,482,000
Additions to property, plant and equipment													(10,964,000)		(12,423,000)		(1,979,000)
Purchases of marketable securities, available-for-sale													(1,308,572,000)		(1,720,473,000)		(1,273,997,000)
Proceeds from sales and maturities of marketable securities, available-for-sale													1,399,774,000		1,742,913,000		821,589,000
Other investing activities, net													118,000		10,000		91,000
Net cash provided by (used for) investing activities from continuing operations													82,311,000		5,984,000		(442,814,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													(58,027,000)		6,447,000		125,035,000
Borrowings against revolving credit facilities, net													49,933,000		0		(22,125,000)
Common stock dividends and stock-based compensation													(1,783,000)		(516,000)		(180,000)
(Increase) decrease in restricted cash													17,989,000		(2,935,000)		(41,853,000)
Intercompany balances													0		0		0
Net cash provided by financing activities from continuing operations													8,112,000		2,996,000		60,877,000
Net decrease in cash and cash equivalents from continuing operations													(67,245,000)		(58,552,000)		(104,008,000)
Cash flows from operating activities-discontinued operations													469,000		2,052,000		6,145,000
Cash flows from investing activities-discontinued operations													(363,000)		(551,000)		0
Cash flows from financing activities-discontinued operations													(89,000)		(1,501,000)		(6,624,000)
Cash and cash equivalents at beginning of period					226,647,000	[1],[2]					285,199,000	[1],[2]	226,647,000	[1],[2]	285,199,000	[1],[2]	389,686,000	[1]
CASH AND CASH EQUIVALENTS AT END OF PERIOD	159,419,000	[2]					226,647,000	[1],[2]					159,419,000	[2]	226,647,000	[1],[2]	285,199,000	[1],[2]
TRG, INC.
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income from continuing operations													(35,630,000)		(80,692,000)		(143,345,000)
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													50,860,000		102,567,000		173,388,000
Changes in assets and liabilities													(51,959,000)		(43,237,000)		151,253,000
Other operating activities, net													(988,000)		2,093,000		(9,629,000)
Net cash (used for) provided by operating activities from continuing operations													(37,717,000)		(19,269,000)		171,667,000
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													(912,000)		(6,443,000)		10,908,000
Additions to property, plant and equipment													(7,368,000)		(6,184,000)		(739,000)
Purchases of marketable securities, available-for-sale													(1,303,185,000)		(1,314,086,000)		0
Proceeds from sales and maturities of marketable securities, available-for-sale													1,393,210,000		1,358,315,000		0
Other investing activities, net													0		0		0
Net cash provided by (used for) investing activities from continuing operations													81,745,000		31,602,000		10,169,000
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													(55,243,000)		2,475,000		125,074,000
Borrowings against revolving credit facilities, net													0				0
Common stock dividends and stock-based compensation													(1,783,000)		(516,000)		(180,000)
(Increase) decrease in restricted cash													18,315,000		(13,470,000)		0
Intercompany balances													(6,625,000)		23,957,000		(316,814,000)
Net cash provided by financing activities from continuing operations													(45,336,000)		12,446,000		(191,920,000)
Net decrease in cash and cash equivalents from continuing operations													(1,308,000)		24,779,000		(10,084,000)
Cash flows from operating activities-discontinued operations													353,000		1,891,000		6,580,000
Cash flows from investing activities-discontinued operations													(237,000)		(390,000)		39,000
Cash flows from financing activities-discontinued operations													(89,000)		(1,501,000)		(6,624,000)
Cash and cash equivalents at beginning of period					26,711,000						1,932,000		26,711,000		1,932,000		12,021,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	25,430,000						26,711,000						25,430,000		26,711,000		1,932,000
GUARANTOR SUBSIDIARIES
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income from continuing operations													(7,063,000)		(19,402,000)		(34,242,000)
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													6,564,000		15,280,000		36,725,000
Changes in assets and liabilities													(40,741,000)		(26,916,000)		84,195,000
Other operating activities, net													0		(2,550,000)		(701,000)
Net cash (used for) provided by operating activities from continuing operations													(41,240,000)		(33,588,000)		85,977,000
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													2,867,000		2,400,000		574,000
Additions to property, plant and equipment													(3,443,000)		(6,206,000)		(1,110,000)
Purchases of marketable securities, available-for-sale													0		(400,583,000)		(1,260,124,000)
Proceeds from sales and maturities of marketable securities, available-for-sale													0		375,906,000		812,108,000
Other investing activities, net													0		0		0
Net cash provided by (used for) investing activities from continuing operations													(576,000)		(28,483,000)		(448,552,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													(2,784,000)		3,972,000		(39,000)
Borrowings against revolving credit facilities, net													0				0
Common stock dividends and stock-based compensation													0		0		0
(Increase) decrease in restricted cash													0		10,468,000		(43,186,000)
Intercompany balances													(15,480,000)		(34,218,000)		316,232,000
Net cash provided by financing activities from continuing operations													(18,264,000)		(19,778,000)		273,007,000
Net decrease in cash and cash equivalents from continuing operations													(60,080,000)		(81,849,000)		(89,568,000)
Cash flows from operating activities-discontinued operations													116,000		161,000		(435,000)
Cash flows from investing activities-discontinued operations													(126,000)		(161,000)		(39,000)
Cash flows from financing activities-discontinued operations													0		0		0
Cash and cash equivalents at beginning of period					177,191,000						259,040,000		177,191,000		259,040,000		349,082,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	117,101,000						177,191,000						117,101,000		177,191,000		259,040,000
NON-GUARANTOR SUBSIDIARIES
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income from continuing operations													5,237,000		847,000		(193,000)
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													588,000		877,000		1,035,000
Changes in assets and liabilities													(84,536,000)		(16,399,000)		19,443,000
Other operating activities, net													0		0		0
Net cash (used for) provided by operating activities from continuing operations													(78,711,000)		(14,675,000)		20,285,000
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													0		0		0
Additions to property, plant and equipment													(153,000)		(33,000)		(130,000)
Purchases of marketable securities, available-for-sale													(5,387,000)		(5,804,000)		(13,873,000)
Proceeds from sales and maturities of marketable securities, available-for-sale													6,564,000		8,692,000		9,481,000
Other investing activities, net													118,000		10,000		91,000
Net cash provided by (used for) investing activities from continuing operations													1,142,000		2,865,000		(4,431,000)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													0		0		0
Borrowings against revolving credit facilities, net													49,933,000				(22,125,000)
Common stock dividends and stock-based compensation													0		0		0
(Increase) decrease in restricted cash													(326,000)		67,000		1,333,000
Intercompany balances													22,105,000		10,261,000		582,000
Net cash provided by financing activities from continuing operations													71,712,000		10,328,000		(20,210,000)
Net decrease in cash and cash equivalents from continuing operations													(5,857,000)		(1,482,000)		(4,356,000)
Cash flows from operating activities-discontinued operations													0		0		0
Cash flows from investing activities-discontinued operations													0		0		0
Cash flows from financing activities-discontinued operations													0		0		0
Cash and cash equivalents at beginning of period					22,745,000						24,227,000		22,745,000		24,227,000		28,583,000
CASH AND CASH EQUIVALENTS AT END OF PERIOD	16,888,000						22,745,000						16,888,000		22,745,000		24,227,000
CONSOLIDATING ELIMINATIONS
CASH FLOWS FROM OPERATING ACTIVITIES
Net (loss) income from continuing operations													7,589,000		18,555,000		34,435,000
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													0		0		0
Changes in assets and liabilities													(7,589,000)		(18,555,000)		(34,435,000)
Other operating activities, net													0		0		0
Net cash (used for) provided by operating activities from continuing operations													0		0		0
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													0		0		0
Additions to property, plant and equipment													0		0		0
Purchases of marketable securities, available-for-sale													0		0		0
Proceeds from sales and maturities of marketable securities, available-for-sale													0		0		0
Other investing activities, net													0		0		0
Net cash provided by (used for) investing activities from continuing operations													0		0		0
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													0		0		0
Borrowings against revolving credit facilities, net													0		0		0
Common stock dividends and stock-based compensation													0		0		0
(Increase) decrease in restricted cash													0		0		0
Intercompany balances													0		0		0
Net cash provided by financing activities from continuing operations													0		0		0
Net decrease in cash and cash equivalents from continuing operations													0		0		0
Cash flows from operating activities-discontinued operations													0		0		0
Cash flows from investing activities-discontinued operations													0		0		0
Cash flows from financing activities-discontinued operations													0		0		0
Cash and cash equivalents at beginning of period					0						0		0		0		0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0						$ 0						$ 0		$ 0		$ 0

[1] Includes cash and cash equivalents associated with discontinued operations of $39,000 at December 31, 2010 and 2009, and $518,000 at December 31, 2008.

[2] Includes cash and cash equivalents associated with discontinued operations of $56,000 at December 31, 2011, and $39,000 at December 31, 2010 and 2009.