Income Taxes - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) entity shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Sep. 30, 2007 shares
Income Tax Contingency [Line Items]
Tax benefit from employee stock plans	$ 30	$ 18,561	$ 25,638
Income tax rate at full distribution of taxable income (percent)	0.00%
Percetage of taxable income distributed	100.00%
Federal income tax rate (percent)	35.00%	35.00%	35.00%
Tax basis of REIT assets in excess of balance sheet	$ 984,400
Valuation allowances against deferred tax assets	4,513	$ 721	$ (10,156)
Valuation allowances against net deferred tax assets	$ 29,894	$ 27,181	31,058	$ 44,868
Net operating loss carryforwards, annual limitation	The analysis indicated that an ownership change occurred during fiscal year 2002, which resulted in an annual limitation of approximately $819,000 for net operating loss carryforwards generated prior to 2003. Therefore, the Company substantially reduced its federal and state net operating loss carryforwards for the periods prior to 2003 to approximately $16,400,000.
Operating loss carryforwards	$ 480,142
Common stock issued | shares	62,134,894	56,505,122
Net operating loss carryforwards attributable to excess tax deductions related to employee stock awards	$ 4,443
Unrecognized tax benefits decreased, interest and penalties accrued	1,701	$ 3,126	$ 1,612
Unrecognized tax benefits, interest and penalties accrued	3,736	$ 5,437
Unrecognized tax benefits that would impact effective tax rate	30,845
Internal Revenue Code [Member]
Income Tax Contingency [Line Items]
Common stock issued | shares					4,211,939
Tax Periods Prior to 2003 [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards, annual limitation on use	819
Tax Periods Prior to 2003 [Member] | Domestic and State Tax Authority [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 16,400
Brazil [Member]
Income Tax Contingency [Line Items]
Number of entities reporting significant losses | entity	2