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Debt Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013 Debt Securities [Member]	Dec. 31, 2012 Debt Securities [Member]	Mar. 31, 2013 Debt Securities [Member] AAA-rated CMBS [Member]	Mar. 31, 2013 Debt Securities [Member] CMBS - Hilton (Fair Value Option) [Member]	Dec. 31, 2012 Debt Securities [Member] CMBS - Hilton (Fair Value Option) [Member]	Nov. 12, 2014 Subsequent Event [Member]	Nov. 12, 2013 Subsequent Event [Member]
Debt Instrument [Line Items]
Aggregate face value of CMBS		$ 258,369	$ 273,343	$ 185,974	$ 72,395	$ 73,239
Debt instrument description	London InterBank Offered Rate (“LIBOR”)
Interest rate of CMBS	2.30%						3.80%	3.30%
Percentage of debt yield	5.60%

X

- Definition

Percentage Of Debt Yield

+ References

No definition available.

+ Details

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X

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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X

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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X

- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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- Details

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