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Fair Value Measurements - Information about Valuation Inputs for Fixed Income Securities Classified as Level 3 (Detail) - Successor [Member]
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Corporate Obligations [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Coupon rate 0.345%  
Fair Value Inputs Maturity 19 years 1 month 21 days  
Yield 4.93%  
Variable Interest Entity, Primary Beneficiary [Member] | United States Transactions [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Coupon rate 5.88% 5.88%
Fair Value Inputs Maturity 22 years 23 days 16 years 4 months 18 days
Yield 9.00% 7.77%
Variable Interest Entity, Primary Beneficiary [Member] | European Transactions [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Coupon rate 0.54% 0.30%
Fair Value Inputs Maturity 17 years 5 months 5 days 21 years 2 months 30 days
Yield 7.46% 9.52%