Leases - Summary of Balance Sheet Classifications of Operating and Finance Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases:
Operating lease right-of-use assets	$ 487,360
Current operating lease liabilities	51,011
Noncurrent operating lease liabilities	438,932
Total operating lease liabilities	489,943
Finance Leases:
Property, plant and equipment	10,829
Accumulated depreciation	(1,570)
Property, plant and equipment, net	9,259
Other current liabilities	3,268	$ 3,249
Other noncurrent liabilities	7,095	7,630
Total finance lease liabilities	$ 10,363	$ 10,879