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Fair Value Measurements - Quantitative Information Related to Significant Unobservable Inputs (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Privately Issued [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair value $ 74 $ 103 $ 1,850 $ 1,023,886
Collateralized Debt Obligations [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair value 47,393 50,316 63,083 61,869
Other Assets and Other Liabilities [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair value 9,879 17,347 $ 3,941 $ 47,859
Discounted Cash Flows [Member] | Collateralized Debt Obligations [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair value $ 47,393 $ 50,316    
Loss severity 100.00% 100.00%    
Discounted Cash Flows [Member] | Collateralized Debt Obligations [Member] | Weighted Average [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Probability of default 31.00% 36.00%    
Discounted Cash Flows [Member] | Collateralized Debt Obligations [Member] | Minimum [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Probability of default 10.00% 12.00%    
Discounted Cash Flows [Member] | Collateralized Debt Obligations [Member] | Maximum [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Probability of default 56.00% 57.00%    
Discounted Cash Flows [Member] | Other Assets and Other Liabilities [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair value $ 9,879 $ 17,347    
Discounted Cash Flows [Member] | Other Assets and Other Liabilities [Member] | Weighted Average [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Commitment expirations 39.00% 17.00%    
Discounted Cash Flows [Member] | Other Assets and Other Liabilities [Member] | Minimum [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Commitment expirations 0.00% 0.00%    
Discounted Cash Flows [Member] | Other Assets and Other Liabilities [Member] | Maximum [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Commitment expirations 60.00% 96.00%    
Two Independent Pricing Quotes [Member] | Privately Issued [Member]        
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]        
Fair value $ 74 $ 103