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Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Cash refunds for:    
Income taxes, net $ (319) $ (66)
Noncash continuing investing and financing activities:    
Supplies and accounts payable associated with additions of property, plant and equipment 12,974 21,251
Series E Redeemable Preferred Stock [Member]    
Noncash continuing investing and financing activities:    
Dividends accrued on Series E Redeemable Preferred 25,885 22,609
Accretion of Series E Redeemable Preferred $ 1,517 $ 1,493