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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]          
Accumulated Other Comprehensive Income (Loss), Restated         $ (55,139)
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         (2,900)
Changes In Accumulated Other Comprehensive Income [Roll Forward]          
Beginning Balance $ 45,854 $ 38,828 $ (52,239) $ (38,990)  
Other comprehensive income before reclassifications (81,869) (16,823) (233,956) (88,903)  
Amounts reclassified from accumulated other comprehensive income (29,898) 7,029 (80,992) 12,767  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 51,971 23,852 152,964 101,670  
Ending Balance 97,825 62,680 97,825 62,680  
Income Tax Expense (Benefit) 2,211 5,439 6,811 31,902  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]          
Changes In Accumulated Other Comprehensive Income [Roll Forward]          
Beginning Balance 153,634 152,847 30,755 118,863  
Other comprehensive income before reclassifications (90,742) 7,801 (264,318) (19,769)  
Amounts reclassified from accumulated other comprehensive income (29,935) 7,367 (80,632) 13,781  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 60,807 (434) 183,686 33,550  
Ending Balance 214,441 152,413 214,441 152,413  
Accumulated Translation Adjustment [Member]          
Changes In Accumulated Other Comprehensive Income [Roll Forward]          
Beginning Balance (114,567) (125,335) (93,634) (167,220)  
Other comprehensive income before reclassifications 8,873 (24,624) 29,806 (66,509)  
Amounts reclassified from accumulated other comprehensive income 0 0 0 0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (8,873) 24,624 (29,806) 66,509  
Ending Balance (123,440) (100,711) (123,440) (100,711)  
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]          
Accumulated Other Comprehensive Income (Loss) [Line Items]          
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets         $ (2,900)
Changes In Accumulated Other Comprehensive Income [Roll Forward]          
Beginning Balance (2,692)   (2,900)    
Other comprehensive income before reclassifications 0   0    
Amounts reclassified from accumulated other comprehensive income 340   548    
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 340   548    
Ending Balance (2,352)   (2,352)    
Other Postretirement Benefits Plan [Member]          
Changes In Accumulated Other Comprehensive Income [Roll Forward]          
Beginning Balance 9,479 11,316 10,640 9,367  
Other comprehensive income before reclassifications 0 0 556 (2,625)  
Amounts reclassified from accumulated other comprehensive income (303) (338) (908) (1,014)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent (303) (338) (1,464) 1,611  
Ending Balance 9,176 10,978 9,176 10,978  
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) 625 0 1,211 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) (241) (723) (723)  
Changes In Accumulated Other Comprehensive Income [Roll Forward]          
Amounts reclassified from accumulated other comprehensive income (303) (338) (908) (1,014)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 62 97 185 291  
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest (303) (338) (908) (1,014)  
Income Tax Expense (Benefit) $ 0 $ 0 $ 0 $ 0