Income Taxes - Details of Reconciliation of Income Taxes (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	21.00%	35.00%
Increase (decrease) in taxes resulting from:
State and local taxes	(13.80%)	(7.80%)	17.30%
Nondeductible items	(1.80%)	(2.90%)	(17.60%)
Tax Cuts and Jobs Act of 2017			(147.70%)
Prior year true-up items	(4.50%)	6.90%	6.80%
Refundable tax credits	0.80%	1.50%	3.60%
Other, net	(0.80%)	(0.10%)	0.10%
Change in valuation allowance	(111.50%)		(0.10%)
Effective income tax rate	(110.60%)	18.60%	(102.60%)