Leases - Schedule of Lease Balances and Classification on Unaudited Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Lessee Lease Description [Line Items]
Operating leases	$ 145,807
Total lease assets	149,797	$ 16,905
Current
Operating leases	4,118
Noncurrent
Operating leases	128,119
Total lease liabilities	136,263	2,965
Other Intangible Assets, Net [Member]
Lessee Lease Description [Line Items]
Operating leases		13,961
Other Assets Net [Member]
Lessee Lease Description [Line Items]
Financing/Capital leases	3,990
Property and Equipment, at Cost [Member]
Lessee Lease Description [Line Items]
Financing/Capital leases		3,066
Capital leases, accumulated depreciation		(122)
Other Accrued Liabilities [Member]
Current
Financing/Capital leases	693	143
Other Liabilities [Member]
Noncurrent
Financing/Capital leases	$ 3,333	$ 2,822