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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Net income	$ 22,082	$ 19,512	$ 46,343	$ 28,258
Weighted-average shares outstanding	27,739	27,237	27,520	27,878
Dilutive effect of employee stock options and restricted shares	1,177	541	1,199	545
Diluted weighted-average shares outstanding	28,916	27,778	28,719	28,423
Basic income per share	$ 0.80	$ 0.72	$ 1.68	$ 1.01
Diluted income per share	$ 0.76	$ 0.70	$ 1.61	$ 0.99
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	500	0	600

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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