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Income Taxes - Summary of Tax Rates (Detail)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Federal tax provision	35.00%	21.00%	21.00%	24.50%	35.00%
State taxes, net of federal effect			4.10%	4.10%	4.40%
Worthless stock deduction					(4.80%)
Stock based compensation				(2.00%)	0.20%
Valuation allowance			(0.10%)	(0.30%)	(0.10%)
Foreign rate differential			0.20%		2.40%
Effect of Federal Tax Reform				1.50%
Other			1.30%	(1.60%)	0.60%
Effective tax rate			26.50%	26.20%	37.70%

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