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Derivative Instruments - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Call Option [Member]
Sep. 30, 2011
Call Option [Member]
Sep. 30, 2012
Call Option [Member]
Sep. 30, 2011
Call Option [Member]
Sep. 30, 2012
Credit Derivatives [Member]
Contract
Dec. 31, 2011
Credit Derivatives [Member]
Sep. 30, 2012
CLOs [Member]
Derivative
Derivative Instruments [Line Items]                  
Value of right to reclaim cash collateral and posted margin recorded in Other assets $ 16,777 $ 47,421              
Value of obligation to return cash collateral, recorded in Other liabilities 0 0              
Gross principal notional outstanding, credit derivatives not written on pay as you go basis                 135,985
Number of credit derivatives transactions not written on a pay-as-you-go basis                 6
Net credit derivative liabilities not written on pay as you go basis at fair value                 214
Number of outstanding credit derivative transactions include ratings based collateral-posting triggers None of our outstanding credit derivative transactions                
Number of credit derivative contracts             4    
Net liability fair value of credit derivative contracts             54,499 46,056  
Notional value of credit derivative contracts             291,446 290,007  
Amount of surplus notes that may be repurchased under stand-alone derivatives 500,000                
Gains in change in fair value of the call options     $ 0 $ 6,910 $ 100,710 $ 13,860