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Summary of Estimated Fair Values of Bonds Held on Deposit (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value $ 716,170 $ 871,135
On Deposit With Governmental Authorities
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 33,866 36,176
Intercompany Trusts Held For Benefit Of U.S. Policyholders
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 496,939 584,683
Held In Trust Pursuant To Third Party Requirements
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 100,382 129,339
Letter Of Credit Held For Third Party Requirements
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value 5,495  
Securities held as collateral for borrowing arrangements
    
Schedule of Available-for-sale Securities [Line Items]    
Estimated Fair Value $ 79,488 [1] $ 120,937 [1]
[1] Amount required to collateralize margin borrowing facility.