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Income Taxes - Reconciliation of the Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory rate	21.00%	35.00%	35.00%
Increase (decrease) in tax resulting from:
State tax provision, net of federal benefit	6.20%	4.00%	5.00%
Foreign tax rate differential	(0.20%)	(3.40%)	(4.40%)
Stock option compensation deduction	(1.10%)	0.10%	0.60%
Withholding taxes	2.10%	1.70%	0.50%
Non-deductible expenses	5.30%	1.80%	1.50%
Change in valuation allowance		3.90%	3.20%
Change in tax legislation	1.90%	5.80%
Audit settlements		(4.00%)
Other, net	(0.60%)	(0.20%)	1.10%
Effective tax rate	34.60%	44.70%	42.50%

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Effective income tax rate reconciliation change in stock options and restricted stock units.

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Percentage of increase (decrease) in effective tax rate for measurement period adjustment from accounting for tax effect pursuant to Tax Cuts and Jobs Act.

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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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