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Difference Between Statutory Federal Income Tax Rate and Effective Income Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory tax rate	35.00%	35.00%	35.00%
State income taxes - net of the federal income tax benefit	1.90%	2.00%	2.10%
Permanent differences	(1.30%)	(0.10%)	(1.30%)
One-time tax effects of tax reform	66.70%
Share-based payments	3.60%
Acquisition related differences	(3.30%)
Other differences, net	(0.80%)	(1.10%)	(2.40%)
Effective tax rate	101.80%	35.80%	33.40%

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Items that are deductible or taxable for tax purposes only. These items are not treated as revenue or expense for book purposes.

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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 equity-based compensation costs.

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