Income Taxes - Differences Between the Income Tax (Provision) Benefit Calculated at the Statutory U.S. Federal Income Tax Rate of 35% and the Actual Income Tax (Provision) Benefit Recorded for Continuing Operations (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal income tax provision										$ (56,914)	$ (34,774)	$ (43,750)
Adjustment for nontaxable income of the REIT										48,680	34,904	44,701
State taxes (net of federal tax benefit and change in state valuation allowance)										(1,933)	(1,477)	950
Permanent share-based compensation adjustment										1,571
Other permanent items										(200)	(165)	(160)
Federal tax credits												112
Federal valuation allowance										5,519	8,271	(853)
Effect of federal tax law change	$ 5,200										5,229
Other										(123)	(133)	467
Total (provision) benefit for income taxes		$ (1,048)	$ (1,822)	$ (1,415)	$ 885	$ 8,430	$ 4,612	$ (866)	$ (321)	$ (3,400)	$ 11,855	$ 1,467