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Income Taxes - Reconciles Statutory Federal Income Tax Rate to Company' s Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Expected provision at federal statutory tax rate	35.00%	35.00%	35.00%
Increases (decreases) resulting from:
State income tax, net of federal tax benefit	3.20%	3.20%	3.40%
Effect of change in tax rate	2.80%		0.10%
Disallowed meals & entertainment	0.40%	0.30%	0.20%
Disallowed compensation	0.40%	0.40%	1.10%
Excess tax benefit	(3.40%)
Other, net	(1.10%)	0.10%	(0.60%)
Total income tax expense (benefit)	37.30%	39.00%	39.20%

X

- Definition

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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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 meals and entertainment expense.

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