Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash payments (refunds) for:
Interest on long-term debt and other, net of capitalized interest	$ 42,184	$ 35,719	$ 34,274
Income taxes, net	(65)	(1,138)	(674)
Noncash investing and financing activities:
Incentive tax credit receivable associated with property, plant and equipment			8,125
Supplies and accounts payable associated with additions of property, plant and equipment	18,350	16,484	17,105
Series E Redeemable Preferred Stock [Member]
Noncash investing and financing activities:
Dividend accrued on Series E Redeemable Preferred	30,729	26,840	23,443
Accretion of Series E Redeemable Preferred	$ 1,995	$ 3,375	$ 6,487