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Subsequent Events (Detail) ft² in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 28, 2016 USD ($) ft² healthcare_property bed state story | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Oct. 28, 2016 GBP (£)
Subsequent Event [Line Items] |  |  |  |
Principal payments received on commercial mortgage loans |  | $ 118,120,000 | $ 41,479,000 |
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Loans funded, amount | $ 6,228,000 |  |  |
Principal payments received on commercial mortgage loans | $ 34,500,000 |  |  |
Subsequent Event [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Extension term of loan | 12 months |  |  |
Subsequent Event [Member] | Luxury Condominium [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Mortgage loan, face amount | £ |  |  |  | £ 100,000
Subsequent Event [Member] | First Mortgage [Member] | Data Center [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Mortgage loan, face amount | $ 80,000,000 |  |  |
Subsequent Event [Member] | Junior Mezzanine Loan [Member] | Healthcare Properties [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Mortgage loan, face amount | $ 130,000,000 |  |  |
Number of properties | healthcare_property | 155 |  |  |
Property size, number of beds | bed | 18,662 |  |  |
Number of states with property in portfolio | state | 20 |  |  |
Subsequent Event [Member] | Preferred Equity Interest [Member] | Condominium [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Mortgage loan, face amount | $ 30,000,000 |  |  |
Property size, area (in square feet) | ft² | 247 |  |  |
Mortgage on real estate, number of stories in real estate property | story | 30 |  |  |
Subsequent Event [Member] | Pari Passu Interests in Pre-Development Mezzanine Loan [Member] | Luxury Condominium [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Mortgage loan, face amount | $ 57,400,000 |  |  | £ 45,000,000

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