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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands | 4 Months Ended | 5 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Dec. 31, 2017 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance |  | $ 1,057,084 |
Balance | $ 1,057,084 | 1,021,944 |
Predecessor |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | 1,651,059 | 2,161 | $ 2,305,554
Balance | 2,161 |  | 1,651,059
Available for Sale Securities |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Gains/(losses) recognized in OCI |  | 87 |
Reclasses from OCI to net income |  | 169 |
Net period OCI |  | 256 |
Balance |  | 256 |
Available for Sale Securities | Predecessor |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (95) | 68 | (208)
Gains/(losses) recognized in OCI | 57 |  | (265)
Reclasses from OCI to net income | 106 |  | 378
Net period OCI | 163 |  | 113
Balance | 68 |  | (95)
Pension/Post-retirement Benefits |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Gains/(losses) recognized in OCI |  | (403) |
Net period OCI |  | (403) |
Balance |  | (403) |
Pension/Post-retirement Benefits | Predecessor |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (438) | (3,036) | 4,683
Gains/(losses) recognized in OCI | (2,598) |  | (5,121)
Net period OCI | (2,598) |  | (5,121)
Balance | (3,036) |  | (438)
Accumulated other comprehensive loss |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Gains/(losses) recognized in OCI |  | (316) |
Reclasses from OCI to net income |  | 169 |
Net period OCI |  | (147) |
Balance |  | (147) |
Accumulated other comprehensive loss | Predecessor |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (10,344) | (12,779) | (6,866)
Gains/(losses) recognized in OCI | (2,541) |  | (5,386)
Reclasses from OCI to net income | 106 |  | 1,908
Net period OCI | (2,435) |  | (3,478)
Balance | (12,779) |  | (10,344)
Currency Translation Adjustment | Predecessor |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance | (9,811) | $ (9,811) | (9,811)
Balance | $ (9,811) |  | (9,811)
Interest Rate Swaps | Predecessor |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Balance |  |  | (1,530)
Reclasses from OCI to net income |  |  | 1,530
Net period OCI |  |  | $ 1,530

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