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Mortgage Loans on Real Estate (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal Amount of Loans subject to delinquent principal or interest | $ 9,800 |  |  |
Balance at beginning of period | 84,541 | 103,705 | 58,719 | 60,378
Additions during period: |  |  |  |
New mortgage loans | 160,995 | 10,000 | 60,618 |
Interest | 4,949 | 811 | 3,106 |
Accretion of discount | 826 | 780 | 250 |
Deductions during period: |  |  |  |
Provision for loan loss reserve | (4,300) | (5,000) | 0 |
Collections of principal | (104) | (25,755) | 0 |
Foreclosures | 0 | 0 | (18,988) |
Balance at close of period | 246,907 | 84,541 | 103,705 |
INVESTMENTS IN AND ADVANCES TO JOINT VENTURES [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | 1,243,254 |  |  | 1,243,254
Face Amount of Mortgages | 332,266 |  |  | 332,266
Carrying Amount of Mortgages | 246,907 |  |  | 246,907
Principal Amount of Loans subject to delinquent principal or interest | 86,995 |  |  | 86,995
SENIOR LOANS and MEZZANINE LOANS Multi-family [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Prior Liens | 153,240 |  |  | 153,240
Face Amount of Mortgages | 82,964 |  |  | 82,964
Carrying Amount of Mortgages | 60,378 |  |  | 60,378
Principal Amount of Loans subject to delinquent principal or interest | 20,149 |  |  | 20,149
Borrower A [Member] | SENIOR LOANS [Member] | Retail [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 5.73% |  |  |
Final Maturity Date | Sep-17 |  |  |
Periodic Payment Terms | Interest and principal |  |  |
Prior Liens | 0 |  |  |
Face Amount of Mortgages | 33,000 |  |  |
Carrying Amount of Mortgages | 28,509 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 0 |  |  |
Borrower B [Member] | MEZZANINE LOANS Multi-family [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | LIBOR+6.0%, Floor 11% |  |  |
Final Maturity Date | Feb-17 |  |  |
Periodic Payment Terms | Interest monthly, principal at maturity |  |  |
Prior Liens | 26,000 |  |  |
Face Amount of Mortgages | 5,868 |  |  |
Carrying Amount of Mortgages | 5,923 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 0 |  |  |
Borrower C [Member] | Retail [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 11.00% |  |  |
Final Maturity Date | Jun-13 |  |  |
Periodic Payment Terms | Interest monthly, principal at maturity |  |  |
Prior Liens | 51,750 |  |  |
Face Amount of Mortgages | 12,800 |  |  |
Carrying Amount of Mortgages | 11,342 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 0 |  |  |
Borrower D [Member] | Retail [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 10.00% |  |  |
Final Maturity Date | Nov-22 |  |  |
Periodic Payment Terms | Interest monthly, principal at maturity |  |  |
Prior Liens | 59,000 |  |  |
Face Amount of Mortgages | 9,000 |  |  |
Carrying Amount of Mortgages | 9,078 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 0 |  |  |
Borrower E [Member] | Mixed Use [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | LIBOR+10.0%, Floor 14% |  |  |
Final Maturity Date | on demand (loan in default) |  |  |
Periodic Payment Terms | Interest monthly, principal at maturity |  |  |
Prior Liens | 2,500 |  |  |
Face Amount of Mortgages | 11,490 |  |  |
Carrying Amount of Mortgages | 5,526 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 9,343 |  |  |
Borrower F [Member] | Mixed Use [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | LIBOR+8.0%, Floor 12% |  |  |
Final Maturity Date | on demand (loan in default) |  |  |
Periodic Payment Terms | Interest monthly, principal at maturity |  |  |
Prior Liens | 13,990 |  |  |
Face Amount of Mortgages | 10,806 |  |  |
Carrying Amount of Mortgages | 0 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 10,806 |  |  |
Borrower G [Member] | INVESTMENTS IN AND ADVANCES TO JOINT VENTURES [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | LIBOR+7.0%, Floor 12% |  |  |
Final Maturity Date | on demand (loan in default) |  |  |
Periodic Payment Terms | Interest monthly, principal at maturity |  |  |
Prior Liens | 0 |  |  |
Face Amount of Mortgages | 66,846 |  |  |
Carrying Amount of Mortgages | 0 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 66,846 |  |  |
Borrower H [Member] | INVESTMENTS IN AND ADVANCES TO JOINT VENTURES [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 10.00% |  |  |
Final Maturity Date | Oct-17 |  |  |
Periodic Payment Terms | Interest monthly, principal at maturity |  |  |
Prior Liens | 137,869 |  |  |
Face Amount of Mortgages | 31,700 |  |  |
Carrying Amount of Mortgages | 31,973 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | 0 |  |  |
Borrower I [Member] | INVESTMENTS IN AND ADVANCES TO JOINT VENTURES [Member] |  |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 10.00% |  |  |
Final Maturity Date | Jun-19 |  |  |
Periodic Payment Terms | Interest quarterly (partial payment), principal and unpaid interest at maturity |  |  |
Prior Liens | 952,145 |  |  |
Face Amount of Mortgages | 150,756 |  |  |
Carrying Amount of Mortgages | 154,556 |  |  |
Principal Amount of Loans subject to delinquent principal or interest | $ 0 |  |  |

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- Definition Total carrying amount of mortgage loans as of the balance sheet date. + 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 210.12-29.6) -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 The amount of principal collected on mortgage loans on real estate during the reporting period. + 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 210.12-29.6) -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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- Definition The amount of mortgage loans on real estate which were foreclosed on during the reporting period. + 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 210.12-29.6) -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 The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans. + 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 Total amount of new mortgage loans on real estate during the reporting period. + 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 210.12-29.6) -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 Total amount of additions to mortgage loans other than new loans during the reporting period. + 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 210.12-29.6) -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 Description of the contractual payment terms of the loan receivable including whether principal and interest is payable at a level or varying amount over the life of the loan, the amount of any balloon payment required at maturity, and any prepayment penalties. + 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 210.12-29.5) -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 principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date. + 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 210.12-29.10(a)) -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 any prior liens on the real estate that secures 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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