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Significant New Business - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Aug. 05, 2016
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Guarantor Obligations [Line Items]                  
Reinsurance premium assumed     $ 1,190,899,000   $ 1,190,899,000   $ 109,358,000    
Deferred charges   $ 254,300,000 247,272,000 $ 265,426,000 247,272,000 $ 265,426,000 $ 255,911,000 $ 0 $ 0
Assumed business     0 $ 305,763,000 1,084,251,000 $ 495,631,000      
Allianz                  
Guarantor Obligations [Line Items]                  
Percentage of reinsurance agreements entered   50.00%              
Coca-Cola | Subsequent Event                  
Guarantor Obligations [Line Items]                  
Reinsurance premium assumed $ 102,700,000                
Assumed business 109,100,000                
Approximate value of additional funds transferred to trust 109,100,000                
Coca-Cola | Subsequent Event | Limited Parental Guarantee                  
Guarantor Obligations [Line Items]                  
Limited parental guarantee obligations, initial amount (up to) 27,000,000                
Allianz                  
Guarantor Obligations [Line Items]                  
Reinsurance premium assumed   $ 1,100,000,000              
Assumed business   $ 1,100,000,000              
Percentage of reinsurance agreements entered   50.00%              
Approximate value of additional funds transferred to trust   $ 110,000,000              
Funds held by reinsured companies     $ 2,200,000,000   $ 2,200,000,000        
Allianz | Limited Parental Guarantee                  
Guarantor Obligations [Line Items]                  
Limited parental guarantee obligations, initial amount (up to)   $ 270,000,000              
Other Assets [Member] | Coca-Cola | Subsequent Event                  
Guarantor Obligations [Line Items]                  
Deferred charges $ 6,400,000