Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities		$ 0	$ 7,521	$ 1,024
Interest paid		(189,443)	(207,433)	(179,431)
Non-cash investing and financing activities included:
Asset retirement costs capitalized, net	[1]	11,193	28,826	20,245
(Decrease) increase in accrued capital expenditures		$ (20,104)	$ (119,021)	$ 71,739

[1] Includes cost incurred whether capitalized or expensed.