Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]
Effective income tax rate reconciliation, repatriation of foreign earnings		$ 24,000
Deferred tax assets, valuation allowance	$ 164,907	164,907	$ 151,808
Operating loss carryforward to additional paid in capital		474,700
Liability for uncertain tax positions	700	700	600
Unrecognized tax benefits that might impact effective tax rate	151,100	151,100
Tax benefits	10,300	(3,442)	8,672	$ 7,327
Gross unrecognized tax benefits	151,100	151,100	$ 142,845	$ 140,889	$ 133,491
Deferred Tax Assets [Member]
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]
Gross unrecognized tax benefits	98,300	98,300
Other Noncurrent Liabilities [Member]
Schedule Of Allocation Of Income Tax Expense Benefit [Line Items]
Gross unrecognized tax benefits	$ 52,800	$ 52,800