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Commercial Mortgage Loans - Commercial Mortgage Loan Portfolio (Detail) (Commercial mortgage loans [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |  |
Original Face Amount | $ 154,844 | $ 154,844
Current Face Amount | 145,928 | 146,550
Carrying Value | 142,833 | 142,921
Coupon | 7.84% | 7.82%
Hotel [Member] | New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2010-01 | 2010-01
Maturity Date | 2015-02 | 2015-02
Original Face Amount | 32,000 | 32,000
Current Face Amount | 31,501 | 31,571
Carrying Value | 31,501 | 31,571
Coupon | Fixed | Fixed
Property Size | 151 | 151
Hotel [Member] | Maryland [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2010-03 | 2010-03
Maturity Date | 2015-04 | 2015-04
Original Face Amount | 26,000 | 26,000
Current Face Amount | 25,186 | 25,273
Carrying Value | 24,935 | 25,273
Coupon | Fixed | Fixed
Property Size | 263 | 263
Office Condo (Headquarters) - NY, NY [Member] | New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2010-02 | 2010-02
Maturity Date | 2015-02 | 2015-02
Original Face Amount | 28,000 | 28,000
Current Face Amount | 27,351 | 27,419
Carrying Value | 27,351 | 27,419
Coupon | Fixed | Fixed
Property Size | 73,419 | 73,419
Mixed Use [Member] | Massachusetts [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-04 | 2012-04
Maturity Date | 2013-12 | 2013-12
Original Face Amount | 23,844 | 23,844
Current Face Amount | 16,890 | 17,287
Carrying Value | 14,444 | 14,105
Coupon | Floating | Floating
Property Size | 20 | 20
Condo Conversion [Member] | New York [Member] |  |
Mortgage Loans on Real Estate [Line Items] |  |
Date of Investment | 2012-12 | 2012-12
Maturity Date | 2015-01 | 2015-01
Original Face Amount | 45,000 | 45,000
Current Face Amount | 45,000 | 45,000
Carrying Value | $ 44,602 | $ 44,553
Coupon | Floating | Fixed
Property Size | 119,000 | 119,000

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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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- Definition Amount of the contractual principal due at the origination of the mortgage loan (face amount). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 29 -Article 12 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph c -Subparagraph Schedule IV -Article 5 + Details
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