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Other Assets and Liabilities - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) Location	Dec. 31, 2014 USD ($) Location
Other Assets and Other Liabilities [Line Items]
Real estate owned (REO)	$ 3,902	$ 4,391
Amount related to transfers into REO	6,000
REO liquidations	3,000
Negative market valuation adjustments on REO	$ 3,000
Sequoia
Other Assets and Other Liabilities [Line Items]
Number of REO properties recorded on balance sheet | Location	19	22

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Other Assets and Other Liabilities [Line Items]

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The number of real estate properties owned as of the balance sheet date.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Amount of real estate investments acquired through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

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Amount of write-down or reserve recognized in the income statement on real estate investments for entities with a substantial portion of business acquiring and holding investment real estate.

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