Supplemental Guarantor Information (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) from continuing operations	$ 28,947		$ 10,407	$ 6,049	$ (3,021)		$ 1,263		$ (3,890)	$ (9,801)	$ (17,439)		$ 42,382		$ (29,867)		$ (80,692)
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													35,582		58,012		118,724
Changes in assets and liabilities													(278,047)		(184,825)		(105,107)
Other operating activities, net													(792)		(988)		(457)
Net cash used for operating activities from continuing operations													(200,875)		(157,668)		(67,532)
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													2,310		1,955		(4,043)
Additions to property, plant and equipment													(12,710)		(10,964)		(12,423)
Purchases of marketable securities, available-for-sale													(1,174,314)		(1,308,572)		(1,720,473)
Proceeds from sales and maturities of marketable securities, available-for-sale													1,136,946		1,399,774		1,742,913
Other investing activities													109		118		10
Net cash (used for) provided by investing activities from continuing operations													(47,659)		82,311		5,984
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													299,935		(58,027)		6,447
Increase (decrease) in borrowings against revolving credit facilities, net													(49,933)		49,933		0
Common stock dividends and stock-based compensation													8,955		(1,783)		(516)
(Increase) decrease in restricted cash													(13,844)		17,989		(2,935)
Intercompany balances													0		0		0
Net cash provided by financing activities from continuing operations													245,113		8,112		2,996
Net decrease in cash and cash equivalents from continuing operations													(3,421)		(67,245)		(58,552)
Cash flows from operating activities-discontinued operations													(104)		469		2,052
Cash flows from investing activities-discontinued operations													75		(363)		(551)
Cash flows from financing activities-discontinued operations													0		(89)		(1,501)
Cash and cash equivalents at beginning of period					159,169	[1],[2]					226,397	[1],[2]	159,169	[1],[2]	226,397	[1],[2]	284,949	[1]
CASH AND CASH EQUIVALENTS AT END OF PERIOD	155,719	[2]					159,169	[1],[2]					155,719	[2]	159,169	[1],[2]	226,397	[1],[2]
TRG, INC.
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) from continuing operations													42,382		(29,867)		(80,692)
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													27,209		50,860		102,567
Changes in assets and liabilities													(168,994)		(57,722)		(43,237)
Other operating activities, net													(792)		(988)		2,093
Net cash used for operating activities from continuing operations													(100,195)		(37,717)		(19,269)
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													708		(912)		(6,443)
Additions to property, plant and equipment													(7,838)		(7,368)		(6,184)
Purchases of marketable securities, available-for-sale													(1,168,833)		(1,303,185)		(1,314,086)
Proceeds from sales and maturities of marketable securities, available-for-sale													1,130,653		1,393,210		1,358,315
Other investing activities													0		0		0
Net cash (used for) provided by investing activities from continuing operations													(45,310)		81,745		31,602
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													301,145		(55,243)		2,475
Increase (decrease) in borrowings against revolving credit facilities, net													0		0
Common stock dividends and stock-based compensation													8,955		(1,783)		(516)
(Increase) decrease in restricted cash													(18,658)		18,315		(13,470)
Intercompany balances													(141,605)		(6,625)		23,957
Net cash provided by financing activities from continuing operations													149,837		(45,336)		12,446
Net decrease in cash and cash equivalents from continuing operations													4,332		(1,308)		24,779
Cash flows from operating activities-discontinued operations													(31)		353		1,891
Cash flows from investing activities-discontinued operations													4		(237)		(390)
Cash flows from financing activities-discontinued operations													0		(89)		(1,501)
Cash and cash equivalents at beginning of period					25,430						26,711		25,430		26,711		1,932
CASH AND CASH EQUIVALENTS AT END OF PERIOD	29,735						25,430						29,735		25,430		26,711
GUARANTOR SUBSIDIARIES
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) from continuing operations													13,337		(7,063)		(19,402)
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													7,873		6,564		15,280
Changes in assets and liabilities													(94,450)		(40,741)		(26,916)
Other operating activities, net													0		0		(2,550)
Net cash used for operating activities from continuing operations													(73,240)		(41,240)		(33,588)
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													1,602		2,867		2,400
Additions to property, plant and equipment													(4,804)		(3,443)		(6,206)
Purchases of marketable securities, available-for-sale													0		0		(400,583)
Proceeds from sales and maturities of marketable securities, available-for-sale													0		0		375,906
Other investing activities													0		0		0
Net cash (used for) provided by investing activities from continuing operations													(3,202)		(576)		(28,483)
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													(1,188)		(2,784)		3,972
Increase (decrease) in borrowings against revolving credit facilities, net													0		0
Common stock dividends and stock-based compensation													0		0		0
(Increase) decrease in restricted cash													0		0		10,468
Intercompany balances													78,396		(15,480)		(34,218)
Net cash provided by financing activities from continuing operations													77,208		(18,264)		(19,778)
Net decrease in cash and cash equivalents from continuing operations													766		(60,080)		(81,849)
Cash flows from operating activities-discontinued operations													(73)		116		161
Cash flows from investing activities-discontinued operations													71		(126)		(161)
Cash flows from financing activities-discontinued operations													0		0		0
Cash and cash equivalents at beginning of period					117,101						177,191		117,101		177,191		259,040
CASH AND CASH EQUIVALENTS AT END OF PERIOD	117,865						117,101						117,865		117,101		177,191
NON-GUARANTOR SUBSIDIARIES
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) from continuing operations													12,668		5,237		847
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													500		588		877
Changes in assets and liabilities													(40,608)		(84,536)		(16,399)
Other operating activities, net													0		0		0
Net cash used for operating activities from continuing operations													(27,440)		(78,711)		(14,675)
CASH FLOWS FROM INVESTING ACTIVITIES
(Contributions to) return of investment in unconsolidated joint ventures, net													0		0		0
Additions to property, plant and equipment													(68)		(153)		(33)
Purchases of marketable securities, available-for-sale													(5,481)		(5,387)		(5,804)
Proceeds from sales and maturities of marketable securities, available-for-sale													6,293		6,564		8,692
Other investing activities													109		118		10
Net cash (used for) provided by investing activities from continuing operations													853		1,142		2,865
CASH FLOWS FROM FINANCING ACTIVITIES
Increase (decrease) in senior debt and short-term borrowings, net													(22)		0		0
Increase (decrease) in borrowings against revolving credit facilities, net													(49,933)		49,933		0
Common stock dividends and stock-based compensation													0		0		0
(Increase) decrease in restricted cash													4,814		(326)		67
Intercompany balances													63,209		22,105		10,261
Net cash provided by financing activities from continuing operations													18,068		71,712		10,328
Net decrease in cash and cash equivalents from continuing operations													(8,519)		(5,857)		(1,482)
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					16,638						22,495		16,638		22,495		23,977
CASH AND CASH EQUIVALENTS AT END OF PERIOD	8,119						16,638						8,119		16,638		22,495
CONSOLIDATING ELIMINATIONS
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss) from continuing operations													(26,005)		1,826		18,555
Adjustments to reconcile net (loss) income from continuing operations to net cash used for operating activities													0		0		0
Changes in assets and liabilities													26,005		(1,826)		(18,555)
Other operating activities, net													0		0		0
Net cash used for 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													0		0		0
Net cash (used for) provided by 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
Increase (decrease) in 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 $56,000 at December 31, 2011, and $39,000 at December 31, 2010 and 2009.

[2] Includes cash and cash equivalents associated with discontinued operations of $27,000, $56,000, and $39,000 at December 31, 2012, 2011 and 2010, respectively.