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DAI-ICHI MERGER - Additional Information (Details) - USD ($)
3 Months Ended 11 Months Ended
Feb. 01, 2015
Mar. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 735,700,000    
Dai-ichi Life | Protective Life Corporation      
Business Acquisition [Line Items]      
Per share merger consideration (in dollars per share) $ 70    
Aggregate cash consideration $ 5,600,000,000    
Goodwill 735,712,000    
Decrease to goodwill     $ 3,300,000
Dai-ichi Life | Protective Life Insurance Company      
Business Acquisition [Line Items]      
Expected tax deductible goodwill 0    
Successor      
Business Acquisition [Line Items]      
Goodwill $ 735,700,000 $ 732,443,000 732,443,000
Decrease to goodwill   0  
Successor | Dai-ichi Life | Protective Life Corporation      
Business Acquisition [Line Items]      
Goodwill   $ 732,400,000 $ 732,400,000