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Comprehensive Income - Schedule of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
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 $ (48,715) $ (52,239)  
Other comprehensive income before reclassifications (88,627) (156,659)  
Amounts reclassified from accumulated other comprehensive income (17,370) (2,044)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 71,257 154,615  
Ending Balance 22,542 99,476  
Income Tax Expense (Benefit) 1,991 2,605  
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]      
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance 85,903 30,755  
Other comprehensive income before reclassifications (73,367) (125,159)  
Amounts reclassified from accumulated other comprehensive income (17,204) (2,855)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 56,163 122,304  
Ending Balance 142,066 153,059  
Accumulated Translation Adjustment [Member]      
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance (141,527) (93,634)  
Other comprehensive income before reclassifications (14,571) (32,056)  
Amounts reclassified from accumulated other comprehensive income 0 0  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 14,571 32,056  
Ending Balance (126,956) (61,578)  
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 (1,965) (2,900)  
Other comprehensive income before reclassifications 0 0  
Amounts reclassified from accumulated other comprehensive income 156 1,114  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 156 1,114  
Ending Balance (1,809) (1,786)  
Other Postretirement Benefits Plan [Member]      
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Beginning Balance 8,874 10,640  
Other comprehensive income before reclassifications (689) 556  
Amounts reclassified from accumulated other comprehensive income (322) (303)  
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent 367 (859)  
Ending Balance 9,241 9,781  
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) (511) 1,708  
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)  
Changes In Accumulated Other Comprehensive Income [Roll Forward]      
Amounts reclassified from accumulated other comprehensive income (322) (303)  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 81 62  
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest (322) (303)  
Income Tax Expense (Benefit) $ 0 $ 0