Income Taxes Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ (65,701)	$ (15,272)	$ (47,315)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	1,856	(1,494)	(1,743)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	64,062	(14,240)	(48,820)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	1,192	(389)	285
Income tax benefit	$ (2,303)	$ 2,137	$ 523
Effective Income Tax Rate Reconciliation, Percent	(0.70%)	3.00%	0.20%
Computed at federal statutory rate	(21.00%)	(21.00%)	(21.00%)
State income taxes, net of federal income tax benefit	(0.60%)	2.10%	0.80%
Deferred Federal Income Tax Expense (Benefit)	$ 1,236	$ 1,236	$ 2,471
Change in valuation allowance	20.50%	(19.60%)	(21.70%)
Other, net	0.40%	(0.50%)	0.10%
Computed at federal statutory rate	21.00%	21.00%	21.00%