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Guarantees, Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]      
Credit losses associated with derivative contracts $ 0 $ 0  
Outstanding commitments to purchase securities 0   $ 0
Outstanding commitments to sell securities $ 0   $ 0