Leases - Components of Lease Cost for Finance Leases and Operating Leases (Detail) $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($)
Finance leases:
Amortization of right-of-use assets	$ 6,624
Interest on lease liability	1,018
Total finance lease cost	7,642
Operating leases:
Lease cost	1,064
Sublease income	(1,325)
Total operating lease (income)/cost	(261)
Total lease cost	$ 7,381