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Secured Debt Arrangements, Net - Additional Information (Details) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 31, 2018 | Jun. 30, 2018 USD ($) subsidiary | Nov. 30, 2017 | Sep. 30, 2018 USD ($) | Sep. 30, 2018 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowings outstanding |  |  |  | $ 1,996,871,000 |  | $ 1,330,847,000 |
Line of Credit [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | 3,000,830,000 |  | 2,290,139,000 |
Securities sold under agreements to repurchase, gross |  |  |  | 2,013,617,000 |  |  |
Borrowings outstanding |  |  |  | 1,996,871,000 |  | 1,330,847,000 |
Line of Credit [Member] | JP Morgan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Securities sold under agreements to repurchase, gross |  |  |  | $ 1,000,185,000 |  |  |
Line of Credit [Member] | DB Repurchase Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extension option |  |  |  | 1 year |  |  |
Maximum borrowing under facility |  |  |  | $ 1,000,000,000 |  |  |
Securities sold under agreements to repurchase, gross |  |  |  | 543,620,000 |  |  |
Borrowings outstanding |  |  |  | 543,600,000 | £ 118,300,000 |  |
Line of Credit [Member] | Goldman Sachs Repurchase Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extension option |  |  | 1 year |  |  |  |
Maximum borrowing under facility |  |  |  | 300,000,000 |  | 331,130,000 |
Securities sold under agreements to repurchase, gross |  |  |  | 205,982,000 |  |  |
Borrowings outstanding |  |  |  | 205,982,000 |  | 81,380,000 |
Line of Credit [Member] | Credit Suisse Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term after either party notifies the other party of intention to terminate |  | 6 months |  |  |  |  |
Line of Credit [Member] | HSBC Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Securities sold under agreements to repurchase, gross |  |  |  | 49,896,000 |  |  |
Line of credit, amount outstanding |  |  |  | 49,900,000 | 38,300,000 |  |
JP Morgan Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Number of subsidiaries | subsidiary |  | 2 |  |  |  |  |
Amended and Restated JPMorgan Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extension option |  | 1 year |  |  |  |  |
Maximum borrowing under facility |  | $ 1,382,000 |  |  |  |  |
Securities sold under agreements to repurchase, gross |  |  |  | 1,000,000,000 | 38,000,000 |  |
Repurchase Facility [Member] | Line of Credit [Member] | JP Morgan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  | 1,250,000 |  |  |  |  |
Asset Specific Financing [Member] | Line of Credit [Member] | JP Morgan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  | $ 132,000,000 |  |  |  |  |
Asset Specific Financing [Member] | Line of Credit [Member] | DB Repurchase Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit, amount outstanding |  |  |  | 55,000,000 |  |  |
USD | Line of Credit [Member] | JP Morgan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | 1,332,450,000 |  | 1,393,000,000 |
Borrowings outstanding |  |  |  | 950,635,000 |  | 944,529,000 |
USD | Line of Credit [Member] | DB Repurchase Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | 900,905,000 |  | 472,090,000 |
Borrowings outstanding |  |  |  | 389,525,000 |  | $ 225,367,000 |
USD | Line of Credit [Member] | Credit Suisse Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | 69,941,000 |  |  |
Securities sold under agreements to repurchase, gross |  |  |  | 69,941,000 |  |  |
Borrowings outstanding |  |  |  | 69,941,000 |  |  |
Term after either party notifies the other party of intention to terminate | 6 months |  |  |  |  |  |
GBP | Line of Credit [Member] | JP Morgan Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | 49,550,000 |  |  |
Borrowings outstanding |  |  |  | 49,550,000 |  |  |
GBP | Line of Credit [Member] | DB Repurchase Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility | £ |  |  |  |  | 154,095,000 |  | £ 93,919,000
Borrowings outstanding | £ |  |  |  |  | 154,095,000 |  | £ 93,919,000
GBP | Line of Credit [Member] | Credit Suisse Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | 143,993,000 |  |  |
Securities sold under agreements to repurchase, gross |  |  |  | 143,993,000 |  |  |
Borrowings outstanding |  |  |  | 143,993,000 | £ 110,500,000 |  |
GBP | Line of Credit [Member] | HSBC Facility [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing under facility |  |  |  | 49,896,000 |  |  |
Borrowings outstanding |  |  |  | $ 49,896,000 |  |  |

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