Acquisitions - Unaudited Pro forma Consolidated Results of Operations (Detail) - Quantum Global Technologies LLC and Dynamic Manufacturing Solutions [Member] - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Business Acquisition [Line Items]
Revenues	$ 266,498	$ 362,729	$ 534,657	$ 751,220
Net income (loss)	$ (202)	$ 14,645	$ 1,683	$ 40,821
Basic earnings per share	$ (0.01)	$ 0.38	$ 0.04	$ 1.08
Diluted earnings per share	$ (0.01)	$ 0.37	$ 0.04	$ 1.06