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Commitments and Contingencies - Supply Commitments (Details) (USD $)
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Mar. 31, 2015
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Dec. 31, 2014
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| Supply Commitment [Line Items] |
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| Development in Process |
$ 269,518,000 |
$ 277,411,000 |
| Construction in Progress [Member] |
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| Supply Commitment [Line Items] |
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| Net Rentable Area |
3,800,000 |
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| Number of Real Estate Properties |
21 |
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| Total anticipated development cost |
412,900,000 |
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| Deferred Costs, Leasing, Gross |
8,000,000 |
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| Construction in Progress [Member] | Comcast Innovation and Technology Center [Member] |
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| Supply Commitment [Line Items] |
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| Net Rentable Area |
1,300,000 |
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| Total anticipated development cost |
932,000,000 |
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| Comcast Innovative and Technology Center [Abstract] |
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| Number of equity method investments |
2 |
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| Number of stories in a high-rise building |
59 |
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| Number of hotel rooms |
222 |
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| Anticipated investment in joint ventures |
185,000,000 |
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| Equity Method Investment, Ownership Percentage |
20.00% |
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| Development Not Yet Commenced [Member] |
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| Supply Commitment [Line Items] |
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| Total anticipated development cost |
167,000,000 |
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| Buildings and land parcels [Member] |
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| Supply Commitment [Line Items] |
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| Remaining amount committed or obligated to pay for the benefit of current or future tenants |
14,800,000 |
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| Tenant Improvements [Member] |
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| Supply Commitment [Line Items] |
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| Tenant improvements not yet completed |
$ 41,500,000 |
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