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Income Taxes - Reconciliation of the Federal Statutory Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax provision at federal statutory rate	35.00%	35.00%	35.00%
Increase (decrease) in tax resulting from:
State tax provision, net of federal benefit	4.00%	5.00%	4.00%
Foreign tax rate differential	(3.40%)	(4.40%)	(3.00%)
Stock option compensation deduction	0.10%	0.60%	2.50%
Withholding taxes	1.70%	0.50%	0.30%
Non-deductible expenses	1.80%	1.50%	1.70%
Change in valuation allowance	3.90%	3.20%	(0.70%)
Change in tax legislation	5.80%		(3.10%)
Audit settlements	(4.00%)
Other, net	(0.20%)	1.10%	1.20%
Effective tax rate	44.70%	42.50%	37.90%

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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 new interpretation of tax law.

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Effective income tax rate reconciliation, foreign withholding taxes.

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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 deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions.

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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 nondeductible expenses.

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