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Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Earnings Per Share Basic [Line Items]
Net income	$ 11,136	$ 28	$ 6,525	$ 1,692
Weighted-average shares of common stock outstanding:
Basic	21,252	21,118	21,200	21,074
Dilutive effect of common stock equivalents arising from share option, nonvested share and nonvested share unit awards	106	25	156	26
Diluted	21,358	21,143	21,356	21,100
Basic earnings per share	$ 0.52	$ 0.00	$ 0.31	$ 0.08
Diluted earnings per share	$ 0.52	$ 0.00	$ 0.31	$ 0.08
Share Option Awards [Member]
Weighted-average shares of common stock outstanding:
Antidilutive shares/unit awards excluded from diluted calculation	778	542	694	482
Nonvested Share Awards and Nonvested Share Unit Awards [Member]
Weighted-average shares of common stock outstanding:
Antidilutive shares/unit awards excluded from diluted calculation	315	489	359	448

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