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DAI-ICHI MERGER - Additional Information (Details) - USD ($)
9 Months Ended 11 Months Ended
Feb. 01, 2015
Sep. 30, 2016
Dec. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 735,700,000    
Successor      
Business Acquisition [Line Items]      
Goodwill $ 735,700,000 $ 732,443,000 $ 732,443,000
Decrease to goodwill   0  
Protective Life Corporation | Dai-ichi Life      
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
Protective Life Corporation | Dai-ichi Life | Successor      
Business Acquisition [Line Items]      
Goodwill   $ 732,400,000 $ 732,400,000
Protective Life Insurance Company | Dai-ichi Life      
Business Acquisition [Line Items]      
Expected tax deductible goodwill $ 0