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Supplemental Cash Flow Information - Additional Information Relating to Cash Flow Activities (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash payments (refunds) for:      
Interest on long-term debt and other, net of capitalized interest $ 34,274 $ 28,049 $ 5,389
Income taxes, net (674) (2,611) (5,845)
Noncash investing and financing activities:      
Incentive tax credit receivable associated with property, plant and equipment 8,125    
Accounts receivable, accounts payable, other liabilities, and long-term debt associated with additions of property, plant and equipment 17,105 16,056 65,471
Accounts payable, long-term debt associated with additions of capitalized internal-use software and software development   759 2,242
Dividend accrued on redeemable preferred stock 23,443 19,733 2,287
Accretion of redeemable preferred stock $ 6,487 $ 6,546 686
Equity issuance costs, including amounts in accounts payable     9,754
Debt issuance costs incurred associated with senior secured notes, including amounts in accounts payable     $ 2,566