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Commercial Mortgage Loans - Commercial Mortgage Loan Portfolio (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Mar. 31, 2013
Mixed Use [Member] | Massachusetts [Member]
Mortgage Loans on Real Estate [Line Items]
Senior sub-participation interest in New York, NY Hotel Loan	$ 120,000	$ 120,000
Repayment of first mortgage	$ 33,000
Condo Conversion [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	Two one-year	Two one-year
Condo Conversion [Member] | New York [Member]
Mortgage Loans on Real Estate [Line Items]
Extension options	Two one-year	Two one-year

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Extension options.

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- Definition

First mortgage loan.

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- Definition

Repayment of first mortgage loans.

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