Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Apr. 01, 2016	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2015	Sep. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data [Abstract]
Total revenues		$ 39,396	$ 96,382	$ 63,556	$ 41,781	$ 52,414	$ 127,600	$ 85,659	$ 71,992			$ 241,115	$ 337,665	$ 373,295
Operating income (loss)		(264)	26,580	4,323	2,401	(131,195)	35,751	(7,964)	(7,767)			33,040	(111,175)	(10,378)
Equity in earnings of unconsolidated entities		0	0	0	1,290	2,213	1,162	(783)	3,561			1,290	6,153	7,753
Gain on purchase of controlling interest in unconsolidated entity	$ 30,000	0	0	30,025	0							30,025	0	0
Income tax benefit (expense)		4,424	(3,070)	0	0	(663)	(8,449)	(666)	0	$ (666)	$ (9,115)	1,354	(9,778)	0
Income (loss) from continuing operations		2,046	20,701	32,188	1,177	(131,779)	25,571	(39,149)	(15,267)	(54,416)	(29,100)	56,112	(160,624)	(60,438)
Discontinued operations		250	0	9,964	(523)	(9,715)	7,614	199,720	7,052			9,691	204,671
Gain on sale of real estate		(766)	0	911	0	20,321	(1,064)	27,337	0			145	46,594	0
Gain from sale of unconsolidated entities		0	0	0	0	0	0	39,252	0			0	39,252	0
Net income (loss)		$ 1,530	$ 20,701	$ 43,063	$ 654	$ (121,173)	$ 32,121	$ 227,160	$ (8,215)	$ 218,945	$ 251,066	$ 65,948	$ 129,893	$ (92,144)
Weighted average number of shares of common stock outstanding (basic and diluted) (in shares)		325,183	325,183	325,183	325,183	325,183	325,183	325,183	325,183			325,183	325,183	324,451
Earnings (loss) per share of common stock (basic and diluted) (in dollars per shares)		$ 0.01	$ 0.06	$ 0.13	$ 0.00	$ (0.37)	$ 0.10	$ 0.70	$ (0.03)	$ 0.67	$ 0.77	$ 0.20	$ 0.40	$ (0.28)