Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Mar. 31, 2021		Mar. 31, 2020	Dec. 31, 2020	[1]
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$ 0		$ 1,789
Interest paid	(64,100)		(50,832)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized	761	[1]	1,250	$ 2,610
Decrease in accrued capital expenditures	$ (5,850)		$ (8,645)

[1] Includes costs incurred whether capitalized or expensed.