Summary of Significant Accounting Policies - Narrative (Details) |
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2016
USD ($)
segment
|
Dec. 31, 2015
USD ($)
|
|
| Summary Of Significant Accounting Policies [Line Items] | ||
| Net assets | $ 7,811,000,000 | $ 7,891,039,000 |
| Net liabilities | $ 4,045,065,000 | 4,429,165,000 |
| Number of segments | segment | 1 | |
| Reserves for uncollectible amounts | $ 14,700,000 | 11,500,000 |
| Accounts receivable | 32,800,000 | 26,300,000 |
| Reserve for losses | 12,200,000 | 12,200,000 |
| Deferred rental revenue receivables | 79,800,000 | 68,000,000 |
| Lender reserves surrendered | 2,300,000 | |
| Provision for income taxes | 0 | |
| Special Purpose Entity | ||
| Summary Of Significant Accounting Policies [Line Items] | ||
| Net assets | 3,080,000,000 | 4,570,000,000 |
| Net liabilities | $ 2,340,000,000 | $ 3,190,000,000 |