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Indebtedness - Additional Information (Detail)
6 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]      
Unpaid Principal Balance $ 958,182,000   $ 1,419,653,000
Recourse Indebtedness      
Debt Instrument [Line Items]      
Unpaid Principal Balance 247,096,000   $ 313,700,000
Recourse Indebtedness | Seventy Five Thousand CMF [Member] | Secured warehouse facilities      
Debt Instrument [Line Items]      
Unpaid Principal Balance 0    
Line of credit facility, borrowing capacity $ 75,000,000    
Debt instrument, financial covenant compliance This facility was not renewed after its June 2018 maturity and it has terminated.    
Recourse Indebtedness | One Hundred Fifty Thousand CMF Two [Member] | Secured warehouse facilities      
Debt Instrument [Line Items]      
Unpaid Principal Balance $ 0    
Line of credit facility, borrowing capacity $ 150,000,000    
Debt instrument, financial covenant compliance This facility was not renewed after its June 2018 maturity and it has terminated.    
Recourse Indebtedness | 7.0% convertible senior notes      
Debt Instrument [Line Items]      
Stated interest rate 7.00%   7.00%
Convertible note conversion rate 206.0859    
Principal amount of convertible note, conversion rate $ 1,000    
Initial conversion price | $ / shares $ 4.85    
Unpaid Principal Balance [1] $ 871,000   $ 871,000
Recourse Indebtedness | 4.0% convertible senior notes      
Debt Instrument [Line Items]      
Stated interest rate 4.00%   4.00%
Convertible note conversion rate 108.5803    
Principal amount of convertible note, conversion rate $ 1,000    
Initial conversion price | $ / shares $ 9.21    
Unpaid Principal Balance [2] $ 68,222,000   $ 110,513,000
Principal amount repurchase convertible senior notes 36,291,000 $ 6,000,000  
Consideration from repurchase convertible senior notes $ 35,319,000 $ 5,708,000  
Recourse Indebtedness | 7.625% senior notes due 2024      
Debt Instrument [Line Items]      
Stated interest rate 7.625%    
Unpaid Principal Balance $ 56,324,000   56,324,000
Covenant leverage ratio   74.60%  
Covenant fixed charge coverage ratio   134.00%  
Recourse Indebtedness | 7.625% senior notes due 2024 | Maximum      
Debt Instrument [Line Items]      
Covenant leverage ratio   80.00%  
Recourse Indebtedness | 7.625% senior notes due 2024 | Minimum      
Debt Instrument [Line Items]      
Covenant fixed charge coverage ratio   120.00%  
Recourse Indebtedness | 7.125% Senior Notes due 2019      
Debt Instrument [Line Items]      
Stated interest rate 7.125%    
Unpaid Principal Balance $ 68,408,000   68,408,000
Covenant leverage ratio   74.60%  
Covenant fixed charge coverage ratio   134.00%  
Recourse Indebtedness | 7.125% Senior Notes due 2019 | Maximum      
Debt Instrument [Line Items]      
Covenant leverage ratio   80.00%  
Recourse Indebtedness | 7.125% Senior Notes due 2019 | Minimum      
Debt Instrument [Line Items]      
Covenant fixed charge coverage ratio   120.00%  
Recourse Indebtedness | Senior Secured Notes      
Debt Instrument [Line Items]      
Unpaid Principal Balance 9,500,000   11,500,000
Payment of notes 2,000,000    
Recourse Indebtedness | Junior subordinated notes, at fair value      
Debt Instrument [Line Items]      
Aggregate principal amount of notes issued 18,671,000    
Fair value of indebtedness 5,111,000    
Recourse Indebtedness | Secured warehouse facilities      
Debt Instrument [Line Items]      
Unpaid Principal Balance     22,313,000
Recourse Indebtedness | Secured warehouse facilities | CMBS Borrowings      
Debt Instrument [Line Items]      
Unpaid Principal Balance 0    
Recourse Indebtedness | Secured warehouse facilities | Commercial mortgage loans      
Debt Instrument [Line Items]      
Unpaid Principal Balance 0    
Line of credit facility, borrowing capacity 150,000,000    
Recourse Indebtedness | Secured warehouse facilities | Floating Rate Loans      
Debt Instrument [Line Items]      
Line of credit facility, borrowing capacity 100,000,000    
Non Recourse Indebtedness      
Debt Instrument [Line Items]      
Unpaid Principal Balance 711,086,000   1,065,123,000
Non Recourse Indebtedness | CMBS securitizations      
Debt Instrument [Line Items]      
Unpaid Principal Balance [4] 459,219,000 [3]   744,763,000 [5]
Underlying collateral 564,094,000   944,894,000
Non Recourse Indebtedness | CMBS securitizations | R A I T F L Seven      
Debt Instrument [Line Items]      
Unpaid Principal Balance 275,259,000    
Underlying collateral 340,738,000    
Non Recourse Indebtedness | CMBS securitizations | R A I T F L Seven | Junior Notes      
Debt Instrument [Line Items]      
Owned unrated classes of junior notes 65,479,000    
Non Recourse Indebtedness | CMBS securitizations | RAIT FL Eight      
Debt Instrument [Line Items]      
Unpaid Principal Balance 183,960,000    
Underlying collateral 228,122,000    
Non Recourse Indebtedness | CMBS securitizations | RAIT FL Eight | Junior Notes      
Debt Instrument [Line Items]      
Owned unrated classes of junior notes 44,162,000    
Non Recourse Indebtedness | Loan Payable On Real Estate      
Debt Instrument [Line Items]      
Unpaid Principal Balance $ 41,082,000   $ 62,297,000
Convertible notes redemption period One | Recourse Indebtedness | 7.0% convertible senior notes      
Debt Instrument [Line Items]      
Convertible senior notes redemption period 2021-04    
Convertible notes redemption period Two | Recourse Indebtedness | 7.0% convertible senior notes      
Debt Instrument [Line Items]      
Convertible senior notes redemption period 2026-04    
[1] Our 7.0% convertible senior notes are redeemable at par, at the option of the holder, in April 2021, and April 2026.
[2] Our 4.0% convertible senior notes are redeemable at par, at the option of the holder, in October 2018, October 2023, and October 2028.
[3] Collateralized by $564,094 principal amount of commercial mortgage loans and participation interests. These obligations were issued by separate legal entities and consequently the assets of the special purpose entities that collateralize these obligations are not available to our creditors.
[4] Excludes CMBS securitization notes purchased by us which are eliminated in consolidation.
[5] Collateralized by $944,894 principal amount of commercial mortgage loans and participation interests in commercial mortgage loans. These obligations were issued by separate legal entities and consequently the assets of the special purpose entities that collateralize these obligations are not available to our creditors