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Acquisitions and Dispositions - Schedule of Estimated Fair Values of Assets Acquired (Detail) (USD $) | Dec. 31, 2013 | Dec. 31, 2013 Management Internalization [Member] | Jun. 10, 2013 Management Internalization [Member] | Dec. 31, 2013 Management Internalization [Member] Trademark [Member] | Dec. 31, 2013 Management Internalization [Member] Database [Member] | Dec. 31, 2013 RJ LLC [Member] | Dec. 31, 2013 Alaska Joint Venture Acquisition [Member] | Jun. 11, 2013 Alaska Joint Venture Acquisition [Member]
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Land |  |  |  |  |  | $ 10,340,000 | $ 156,648,000 |
Building and improvements |  | 4,214,000 |  |  |  | 54,123,000 | 740,396,000 |
Identified intangible assets |  |  |  | 3,100,000 | 2,100,000 |  |  |
Receivable for net cash flows prior to acquisition date |  |  |  |  |  |  | 1,896,000 | 1,896,000
Value of in-place leases |  |  |  |  |  | 539,000 | 5,547,000 |
Goodwill | 120,655,000 | 120,655,000 | 120,655,000 |  |  |  |  |
Cash and cash equivalents |  |  |  |  |  | 1,128,000 |  |
Other current assets and liabilities, net |  |  |  |  |  | (311,000) |  |
Note payable |  |  |  |  |  | (7,600,000) |  |
Fair value of acquired assets |  | 130,069,000 |  |  |  |  | 904,487,000 | 904,487,000
Noncontrolling interest |  |  |  |  |  | (39,321,000) |  |
Fair value of acquired net assets |  |  |  |  |  | $ 18,898,000 |  |

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