Leases - Summary of Balances Related to Lease Portfolio within Condensed Consolidated Statement of Cash Flow (Parenthetical) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	[1]	Jul. 01, 2018
Leases [Abstract]
Principal payments on capital lease obligations	$ 4,261		$ 4,000
Interest payments on capital lease obligations	$ 1,417		$ 1,800

[1] During the first half of 2018, the Company had principal payments on capital lease obligations of $4.0 million and interest payments on capital lease obligations of $1.8 million.