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Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance |  |  |  | $ 1,057,084 | $ 1,021,944 |  |
Balance | $ 975,526 |  | $ 1,057,084 | 1,021,944 | 975,526 |  |
Predecessor |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance |  | $ 1,651,059 | 1,651,059 | 2,161 |  | $ 1,747,564 | $ 2,305,554
Balance |  | 1,125,830 | 2,161 |  |  | 1,125,830 | 1,651,059
Available for Sale Securities |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance | (43) |  |  |  | 256 |  |
Gains/(losses) recognized in OCI | 0 |  |  | 87 | (660) |  |
Reclasses from OCI to net income | 43 |  |  | 169 | 404 |  |
Net period OCI | 43 |  |  | 256 | (256) |  |
Balance | 0 |  |  | 256 | 0 |  |
Available for Sale Securities | Predecessor |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance |  | (95) | (95) | 68 |  | (1) | (208)
Gains/(losses) recognized in OCI |  | 6 | 57 |  |  | (209) | (265)
Reclasses from OCI to net income |  | 80 | 106 |  |  | 201 | 378
Net period OCI |  | 86 | 163 |  |  | (8) | 113
Balance |  | (9) | 68 |  |  | (9) | (95)
Pension/Post-retirement Benefits |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance | (403) |  |  |  | (403) |  |
Gains/(losses) recognized in OCI | 0 |  |  | (403) | 0 |  |
Reclasses from OCI to net income | 0 |  |  |  | 0 |  |
Net period OCI | 0 |  |  | (403) | 0 |  |
Balance | (403) |  |  | (403) | (403) |  |
Pension/Post-retirement Benefits | Predecessor |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance |  | (438) | (438) | (3,036) |  | 4,683 | 4,683
Gains/(losses) recognized in OCI |  | 0 | (2,598) |  |  | (5,121) | (5,121)
Reclasses from OCI to net income |  | 0 |  |  |  | 0 |
Net period OCI |  | 0 | (2,598) |  |  | (5,121) | (5,121)
Balance |  | (438) | (3,036) |  |  | (438) | (438)
Accumulated other comprehensive loss |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance | (446) |  |  |  | (147) |  |
Gains/(losses) recognized in OCI | 0 |  |  | (316) | (660) |  |
Reclasses from OCI to net income | 43 |  |  | 169 | 404 |  |
Net period OCI | 43 |  |  | (147) | (256) |  |
Balance | $ (403) |  |  | (147) | $ (403) |  |
Accumulated other comprehensive loss | Predecessor |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance |  | (10,344) | (10,344) | (12,779) |  | (6,446) | (6,866)
Gains/(losses) recognized in OCI |  | 6 | (2,541) |  |  | (5,330) | (5,386)
Reclasses from OCI to net income |  | 80 | 106 |  |  | 1,518 | 1,908
Net period OCI |  | 86 | (2,435) |  |  | (3,812) | (3,478)
Balance |  | (10,258) | (12,779) |  |  | (10,258) | (10,344)
Currency Translation Adjustment | Predecessor |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance |  | (9,811) | (9,811) | $ (9,811) |  | (9,811) | (9,811)
Gains/(losses) recognized in OCI |  | 0 |  |  |  | 0 |
Reclasses from OCI to net income |  | 0 |  |  |  | 0 |
Net period OCI |  | 0 |  |  |  | 0 |
Balance |  | (9,811) | $ (9,811) |  |  | (9,811) | (9,811)
Interest Rate Swaps | Predecessor |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |
Balance |  |  |  |  |  | (1,317) | (1,530)
Gains/(losses) recognized in OCI |  |  |  |  |  | 0 |
Reclasses from OCI to net income |  |  |  |  |  | 1,317 | 1,530
Net period OCI |  |  |  |  |  | 1,317 | $ 1,530
Balance |  | $ 0 |  |  |  | $ 0 |

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