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Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash payments (refunds) for:      
Interest on long-term debt and other, net of capitalized interest $ 35,719 $ 34,274 $ 28,049
Income taxes, net (1,138) (674) (2,611)
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 16,484 17,105 16,056
Dividends accrued on redeemable preferred 26,840 23,443 19,733
Accretion of redeemable preferred $ 3,375 $ 6,487 $ 6,546