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Summary of Significant Accounting Policies - Schedule of Restricted Cash and Deposits in Escrow, Classified Within Deferred Costs and Other Assets, Net (Details) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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| Restricted Cash and Cash Equivalents Items [Line Items] |
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| Restricted cash and investments |
$ 100,344 |
$ 58,691 |
| Collateral Deposits [Member] |
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| Restricted Cash and Cash Equivalents Items [Line Items] |
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| Restricted cash and investments |
29,483 |
21,816 |
| Tenant Improvements, Repairs and Leasing Commissions [Member] |
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| Restricted Cash and Cash Equivalents Items [Line Items] |
|
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| Restricted cash and investments |
13,427 |
10,297 |
| Master Trust Release and Title Company Escrow [Member] |
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| Restricted Cash and Cash Equivalents Items [Line Items] |
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| Restricted cash and investments |
53,069 |
21,893 |
| Loan Impounds [Member] |
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| Restricted Cash and Cash Equivalents Items [Line Items] |
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| Restricted cash and investments |
794 |
2,018 |
| Other Restricted Cash and Escrow Deposits [Member] |
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| Restricted Cash and Cash Equivalents Items [Line Items] |
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| Restricted cash and investments |
$ 3,571 |
$ 2,667 |