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Financial Instruments Owned and Pledged as Collateral at Fair Value, Securities Purchased Under Agreements to Resell and Securities Sold Under Agreements to Repurchase - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2016
Banking and Thrift [Abstract]
Securities average estimated maturity period (in years)	7 months 27 days
Confidence Level Value At Risk	98.00%
Value At Risk Threshold	0.10%

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- Definition

Confidence Level Value At Risk

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No definition available.

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- Definition

Securities average estimated maturity period.

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No definition available.

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- Definition

Value At Risk Threshold

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No definition available.

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- References

No definition available.

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