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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Thousands
3 Months Ended
Mar. 01, 2018
USD ($)
Mar. 31, 2018
USD ($)
Country
State
Dec. 31, 2017
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Number of countries in which company operates | Country   20  
Number of states in which company licensed to sell insurance and annuities | State   49  
Cash dividends Payable, Date Declared Mar. 01, 2018    
Cash dividend declared $ 200,000 $ 200,000  
Cash dividend payable, date to be paid Apr. 20, 2018    
Accumulated Other Comprehensive Income      
Summary Of Significant Accounting Policies [Line Items]      
Cumulative effect adjustment [1],[2]     $ (3,023)
Retained Earnings (Deficit)      
Summary Of Significant Accounting Policies [Line Items]      
Cash dividend declared   $ 200,000  
Cumulative effect adjustment [2]     $ 3,023
[1] See Note 1 Summary of Significant Accounting Policies, for discussion on the adjustment relating to ASU 2016-01
[2] See Note 1 Summary of Significant Accounting Policies, for discussion on the adjustment relating to Accounting Standards Update 2016-01.