Equity - Additional Information (Detail) - USD ($)		12 Months Ended
	Nov. 12, 2015	Jan. 02, 2016	Jan. 03, 2015	Dec. 31, 2016	Nov. 21, 2013
Equity, Class of Treasury Stock [Line Items]
Stock repurchase authorized amount					$ 30,000,000
Shares of common stock repurchased		3,419,000	1,185,000
Cost of stock repurchased		$ 18,503,000	$ 8,302,000
Stock repurchase remained available for future stock repurchase				$ 1,500,000
NRC
Equity, Class of Treasury Stock [Line Items]
Shares of common stock repurchased	1,483,171
Outstanding common stock repurchased percentage	6.80%
Purchase price per share	$ 4.98
Cost of stock repurchased	$ 7,400,000