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Income Taxes - Reconciliation of Pre-Tax Income (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory tax rate	35.00%	35.00%	35.00%
Tax Reform	12.00%
State taxes, net of federal benefit	2.00%	2.00%	3.00%
Non-deductible expenses	2.00%		1.00%
Change in valuation allowance	(2.00%)	2.00%	(1.00%)
Reserves for uncertain tax positions	(2.00%)		1.00%
Credits and exemptions	(3.00%)	(2.00%)	(2.00%)
Foreign rate differential	(5.00%)	(2.00%)	(2.00%)
Other	1.00%	(1.00%)	1.00%
Effective tax rate	40.00%	34.00%	36.00%

X

- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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