Goodwill - Schedule of Reconciliation of Activity for Goodwill (Detail) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance	$ 144,586	$ 117,954
Goodwill, Expansion Transactions	19,035	22,031
Goodwill, Lexington Asset Exchange Transaction		(682)
Goodwill, Measurement period adjustment	1,807	1,968
Goodwill, Balance held for sale	(12,727)
Goodwill, Ending Balance	$ 152,701	$ 141,271