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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 03, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Income Taxes [Line Items]
Increase in income tax expense		$ 576
Income tax expense		$ 1,954	$ 1,378	$ 5,015	$ 3,672
Effective tax rate		32.10%	31.30%	29.20%	27.90%
Internal Revenue Service
Income Taxes [Line Items]
Amount paid to IRS	$ 11,580
Deferred Tax Assets And Income Taxes Payable
Income Taxes [Line Items]
Prior period reclassification adjustment						$ 12,598
State and Local Jurisdiction | Minimum
Income Taxes [Line Items]
Income Tax Examination Period				2012
State and Local Jurisdiction | Maximum
Income Taxes [Line Items]
Income Tax Examination Period				2015
ASU 2016-09
Income Taxes [Line Items]
Discrete tax benefit				$ (333)

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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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