Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Net deferred tax assets	$ 109,861	$ 151,225
Unrecognized tax benefits that would impact effective tax rate if recognized	$ 5,100	3,600
Federal statutory income tax rate	35.00%
U.S. Federal
Income Tax Contingency [Line Items]
Operating loss carryforwards	$ 26,700	27,700
Deferred tax asset not subject to expiration	9,400	9,700
Deferred tax asset, valuation allowance, not subject to expiration	6,500	6,500
Deferred income tax asset	29,900	24,600
State and Local
Income Tax Contingency [Line Items]
Deferred tax asset not subject to expiration	12	8,800
Deferred tax asset, valuation allowance, not subject to expiration	12	12
Foreign
Income Tax Contingency [Line Items]
Operating loss carryforwards	150,500	114,600
Deferred income tax asset	$ 29,900	$ 24,600