Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Disclosure [Line Items]
Income tax benefit related previous period operations	$ 500,000		$ 500,000	$ 1,200,000
Benefit for income taxes	463,000	12,450,000	371,000	80,526,000
Income tax benefit related to current period operations		(5,400,000)	100,000	(6,400,000)
Tax benefit related to the reversal of liabilities associated with unrecognized tax positions				6,900,000
Reversal of deferred tax liabilities		7,100,000
Company's reserve for uncertain tax benefits				12,400,000
Income Tax benefit				4,800,000
Reduction to the related accrued interest as an income tax benefit				2,100,000
Unrecognized tax benefits	0		0		0
REIT Conversion [Member]
Income Tax Disclosure [Line Items]
Benefit for income taxes				$ 66,000,000