Income Taxes - Reconciliation of Effective Tax Rate and the Federal Statutory Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate (as a percent)	21.00%	21.00%	34.00%
State income taxes, net of federal income tax benefit (as a percent)	(19.47%)	11.01%	(4.96%)
Non-deductible expenses (as a percent)	7.49%	3.80%	(17.57%)
Compensation expense (as a percent)	(135.12%)	(12.52%)	(25.95%)
Transaction expenses (as a percent)	0.00%	7.09%	0.00%
Deferred revaluation for Tax Cuts and Jobs Act (as a percent)	0	0	1.1624
Adjustments due to adoption of Accounting Standards (as a percent)	0.00%	(13.84%)	0.00%
Deferred income tax adjustments (as a percent)	(10.98%)	0.00%	0.00%
Foreign Tax Rate Differential (as a percent)	0.00%	7.20%	(12.99%)
Other, net (as a percent)	(8.32%)	(1.21%)	(3.72%)
Valuation allowance (as a percent)	25.74%	8.44%	0.00%
Effective tax rate (as a percent)	(119.66%)	30.97%	85.05%