Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 392	$ 7,159
Effective income tax expense (benefit) rate	15.60%	34.60%
Gain on Divestitures	$ 0	$ 18,815
Unrecognized tax benefits	3,400		$ 3,000
Expected reduction in unrecognized tax benefits	$ 2,100