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Schedule of Fair Value Other Financial Instruments Measured (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Mar. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets | $ 399,322 |
Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets |  | $ 664,412
Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets | 399,322 |
Quoted Prices In Active Markets (Level 1) | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets |  | 664,412
Money Market Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets | 399,322 |
Money Market Cash Equivalents | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets |  | 664,412
Money Market Cash Equivalents | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets | $ 399,322 |
Money Market Cash Equivalents | Quoted Prices In Active Markets (Level 1) | Predecessor |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of assets |  | $ 664,412

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