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Long-Term Debt and Capital Leases - Components of Interest Expense (Detail) - USD ($)
$ in Thousands
 8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Interest Expense, Debt [Abstract]        
Interest expense on long-term debt and capital leases $ 23,065 $ 35,868 $ 34,216 $ 36,955
Amortization of debt financing costs 2,020 3,613 2,757 3,325
Amortization of debt discounts 173 364 243 626
Letter of credit fees 714 637 1,215 1,032
Less: capitalized interest (333) (62) (256) (368)
Total interest expense $ 25,639 $ 40,420 $ 38,175 $ 41,570