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Subordinate Loans - Company's Subordinate Loan Portfolio (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Hotel Portfolio - New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | Three one-year | Three one-year
Retail Center - Virginia [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | Two one-year | Two one-year
Hotel NY NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | One-year | One-year
Hotel - New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | Two one-year | Two one-year
Hotel Portfolio - Various [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | One-year | One-year
Condo Construction - NY, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | One-year |
Unfunded loan commitments | 10,861 |
Multifamily Conversion - NY, NY [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | One-year |
Condo Conversion [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Extension options | Two one-year | Two one-year
Unfunded loan commitments | 34,650 | 34,650

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