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Schedule II - Valuation Accounts (Detail) - Allowance for Doubtful Accounts [Member] - USD ($)
$ in Thousands
8 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Apr. 30, 2014
Apr. 30, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]        
Balance at beginning of period $ 1,672 $ 2,153 $ 1,332 $ 740
Additions-Charged to expense 1,524 1,344 1,586 1,682
Deductions-Bad debts written off, net of recoveries (1,043) (2,509) (1,246) (1,090)
Balance at end of period $ 2,153 $ 988 $ 1,672 $ 1,332