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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) - Successor [Member] - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | $ (2,775) | $ 58,012 | $ (38,990) | $ 15,215
Other comprehensive income before reclassifications | 44,362 | 471 | 69,455 | 34,252
Amounts reclassified from accumulated other comprehensive income | (2,759) | (7,708) | 8,363 | 1,308
Net current period other comprehensive income | 41,603 | (7,237) | 77,818 | 35,560
Ending Balance | 38,828 | 50,775 | 38,828 | 50,775
Income Tax Expense (Benefit) | 6,882 | 3,156 | 26,463 | 6,595
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | 140,198 | 110,754 | 118,863 | 50,963
Other comprehensive income before reclassifications | 15,070 | 55,623 | 27,570 | 107,185
Amounts reclassified from accumulated other comprehensive income | (2,421) | (7,453) | 6,414 | 776
Net current period other comprehensive income | 12,649 | 48,170 | 33,984 | 107,961
Ending Balance | 152,847 | 158,924 | 152,847 | 158,924
Accumulated Translation Adjustment [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (154,627) | (62,873) | (167,220) | (45,092)
Other comprehensive income before reclassifications | 29,292 | (55,152) | 41,885 | (72,933)
Amounts reclassified from accumulated other comprehensive income | 0 | 0 | 0 | 0
Net current period other comprehensive income | 29,292 | (55,152) | 41,885 | (72,933)
Ending Balance | (125,335) | (118,025) | (125,335) | (118,025)
Other Postretirement Benefits Plan [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | 11,654 | 10,131 | 9,367 | 9,344
Other comprehensive income before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from accumulated other comprehensive income | (338) | (255) | 1,949 | 532
Net current period other comprehensive income | (338) | (255) | 1,949 | 532
Ending Balance | 11,316 | 9,876 | 11,316 | 9,876
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member] |  |  |  |
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Income Tax Expense (Benefit) | 0 | 0 | 0 | 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (241) | (167) | (482) | (333)
Changes In Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from accumulated other comprehensive income | (338) | (255) | 1,949 | 532
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | 97 | 88 | (2,431) | (865)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest | (338) | (255) | 1,949 | 532
Income Tax Expense (Benefit) | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Net of tax amount of other comprehensive income (loss) excluding noncontrolling interest. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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