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Income Taxes - Schedule of Effective Income Tax Reconciliation (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal tax expense at statutory rate									$ 14,090	$ 13,632	$ 13,349
Increase (reduction) in income taxes resulting from:
State tax, net of federal benefit									1,253	1,275	1,098
Non-deductible compensation											378
Tax rate change	$ (3,100)								(3,122)
Excess tax benefits from share-based awards									(1,603)
Research and development tax credits									(400)
Other									76	10	(51)
Total	$ 923	$ 3,235	$ 3,751	$ 2,385	$ 4,014	$ 4,020	$ 3,668	$ 3,215	$ 10,294	$ 14,917	$ 14,774

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The amount by which income tax is affected due to the excess tax benefits or deficiencies from share-based awards.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount 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 increase (decrease) in the income tax rates.

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