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Guarantees, Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		6 Months Ended
	Sep. 27, 2007 Complaints	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Complaints	Dec. 31, 2013
Long-term Purchase Commitment [Line Items]
Credit losses associated with derivative contracts		$ 0	$ 0
Outstanding commitments to purchase securities		600,000		600,000	3,000,000
Outstanding commitments to sell securities		$ 0		$ 0	$ 0
Number of allegations asserted separate counts	18
Number of pending allegations				2
Unjust Enrichment [Member]
Long-term Purchase Commitment [Line Items]
Number of pending allegations				1
Breach of Contract [Member]
Long-term Purchase Commitment [Line Items]
Number of pending allegations				1