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Income Taxes - Reconciliation of Pre-Tax Income (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	35.00%	35.00%
State taxes, net of federal benefit	3.00%	2.00%	2.00%
Non-deductible expenses	2.00%	2.00%
Tax Reform	1.00%	12.00%
Change in valuation allowance	(1.00%)	(2.00%)	2.00%
Acquisition-related costs	(2.00%)
Credits and exemptions	(2.00%)	(3.00%)	(2.00%)
Foreign rate differential		(5.00%)	(2.00%)
Reserves for uncertain tax positions		(2.00%)
Other	1.00%	1.00%	(1.00%)
Effective tax rate	23.00%	40.00%	34.00%

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Effective income tax rate reconciliation acquisition related costs.

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