Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 64,482	$ 90,366
Increase (decrease) in the total valuation allowance	28,600
Net operating loss carryforwards for state income tax purposes	671,100
Federal operating loss carry forwards	68,100
Accrued interest and penalties related to the unrecognized tax benefits	3,400	1,500
Total unrecognized tax benefits	42,773	$ 34,152	$ 31,558	$ 26,155
Deferred Tax Asset, Net Operating Loss Carryforward
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 474,100