Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Taxes [Line Items]
Minimum distribution Percentage of Taxable Income to avoid Federal Income Taxes		100.00%
Current income tax expense			$ 100,000	$ 900,000
Tax benefits associated with equity-based compensation		351,000	2,609,000	1,845,000
Effective tax rate		(79.60%)	35.80%	37.20%
Net deferred tax benefit	$ 137,700,000	$ (151,037,000)	$ 5,761,000	$ 19,321,000
Minimum
Income Taxes [Line Items]
Minimum Distribution Percentage of Taxable Income to Qualify for Real Estate Investment Trust		90.00%