Leases - Summary of Balance Sheet Classifications of Operating and Finance Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Operating Leases:
Operating lease right-of-use assets	$ 484,853
Current operating lease liabilities	51,751
Noncurrent operating lease liabilities	436,698
Total operating lease liabilities	488,449
Finance Leases:
Property, plant and equipment	10,800
Accumulated depreciation	(2,325)
Property, plant and equipment, net	8,475
Other current liabilities	3,058	$ 3,249
Other noncurrent liabilities	6,473	7,630
Total finance lease liabilities	$ 9,531	$ 10,879