Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash payments (refunds) for:
Interest on long-term debt and other, net of capitalized interest	$ 45,730	$ 42,184	$ 35,719
Income taxes, net	(312)	(65)	(1,138)
Noncash investing and financing activities:
Accounts receivable, supplies and accounts payable associated with additions of PP&E	16,286	18,350	16,484
Series E Redeemable Preferred Stock [Member]
Noncash investing and financing activities:
Dividend accrued on Series E Redeemable Preferred	35,182	30,729	26,840
Accretion of Series E Redeemable Preferred	$ 2,026	$ 1,995	$ 3,375