Supplemental Cash Flow Information - Supplemental Cash Flow Information (Detail) - USD ($) $ in Thousands	6 Months Ended			12 Months Ended
	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019	[1]
Net cash provided from operating activities included:
Income taxes refunded from taxing authorities	$ 2,154		$ 0
Interest paid	(78,265)		(99,675)
Non-cash investing and financing activities included:
Increase in asset retirement costs capitalized	4,247	[1]	2,326	$ 11,193
(Decrease) increase in accrued capital expenditures	$ (31,307)		$ 6,346

[1] Includes costs incurred whether capitalized or expensed.