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, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Statutory federal income tax (provision) benefit									$ (43,750)	$ (9,035)	$ 10,034
Adjustment for nontaxable income of the REIT									44,701	32,642
State taxes (net of federal tax benefit and change in valuation allowance)									950	3,216	(523)
Permanent items									(160)	1,092	(384)
Nondeductible compensation											(2,319)
Nondeductible transaction costs											(6,632)
Federal tax credits									112		542
Federal valuation allowance									(853)	(3,509)	884
Unrecognized tax benefits										6,261	432
REIT conversion										62,063
Other									467	(68)
Total benefit for income taxes	$ 1,096	$ 463	$ (576)	$ 484	$ 12,136	$ 12,450	$ 1,784	$ 66,292	$ 1,467	$ 92,662	$ 2,034