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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, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Federal tax provision	35.00%	21.00%	24.50%	35.00%	35.00%
State taxes, net of federal effect			4.10%	4.40%	3.60%
Worthless stock deduction				(4.80%)
Stock based compensation			(2.00%)	0.20%	(0.50%)
Valuation allowance			(0.30%)	(0.10%)	(3.20%)
Foreign rate differential				2.40%	0.50%
Effect of Federal Tax Reform			1.50%
Other			(1.60%)	0.60%	(0.30%)
Effective tax rate			26.20%	37.70%	35.10%

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