Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Increase (decrease) in the total valuation allowance	$ 25,900
Net operating loss carryforwards for federal income tax purposes	16,000
Net operating loss carryforwards for state income tax purposes	794,200
Federal operating loss carry forwards	114,300
Valuation allowance	90,340	$ 64,482
Interest and penalties related to the unrecognized tax benfits	5,700	3,400
Accumulated interest and penalties	12,500	12,700
Total unrecognized tax benefits	35,749	$ 42,773	$ 34,152	$ 31,558
Foreign tax credit	51,300
Valuation allowance of foreign tax credit	51,300
Deferred Tax Asset, Net Operating Loss Carryforward
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 39,000