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Reconciliation between Federal Statutory Rate and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal income tax benefit	2.20%	2.40%	2.30%
Tax effects of foreign operations	(1.20%)	(0.80%)	(0.90%)
Tax benefit from settlement of employee equity awards	(1.90%)	(0.00%)	(0.00%)
Enactment of the TCJA-17	(1.70%)	(0.00%)	(0.00%)
Other items	0.20%	0.20%	0.30%
Impact of income attributable to noncontrolling interests	(0.60%)	(1.40%)	(2.20%)
Effective tax rate	32.00%	35.40%	34.50%

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Effective income tax rate reconciliation impact of income attributable to noncontrolling interest.

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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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