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Statutory U.S. Federal Income Tax Rate Reconcilation to Effective Income Tax Rates (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
State income taxes, net of related federal income tax benefit	1.20%	1.50%	1.60%
Foreign income taxed at different rates	(4.60%)	(6.50%)	(4.90%)
Transition Tax	13.70%	0.00%	0.00%
US net deferred tax liability remeasurement	(6.00%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	0.30%	0.00%	(2.30%)
Other, net	(0.20%)	1.70%	1.50%
Effective income tax rates	39.40%	31.70%	30.90%

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Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act of 2017, Transition Tax on Accumulated Foreign Earnings, Percent

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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 income tax rates.

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