Depreciation, Depletion, Amortization and Impairment Expense Related to Property and Equipment and Intangible Assets and Liabilities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Abstract]
Depreciation and impairment expense	$ 887,155	$ 753,510	$ 657,571
Amortization expense	18,197	21,764	3,643
Depletion expense	10,966	8,067	7,220
Total	$ 916,318	$ 783,341	$ 668,434