Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Minimum Distribution Percentage of Taxable Income to Qualify for Real Estate Investment Trust		90.00%
Minimum distribution Percentage of Taxable Income to avoid Federal Income Taxes		100.00%
Tax benefits associated with equity-based compensation		$ 525,000	$ 665,000	$ 351,000
Effective tax rate		3.60%	3.40%	(79.60%)
Expected net tax benefit	$ 137,700,000
Liabilities for uncertain tax positions		$ 0	$ 0
Income tax receivable		$ 21,200,000	$ 12,800,000