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Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail)
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9 Months Ended | |
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Sep. 30, 2013
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Sep. 30, 2012
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| All intangible assets and liabilities | 12 years 8 months 12 days | 3 years 2 months 12 days |
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In-Place Leases [Member]
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| All intangible assets and liabilities | 3 years 1 month 6 days | |
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Leasing Commissions [Member]
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| All intangible assets and liabilities | 12 years 8 months 12 days | 4 years 8 months 12 days |
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Customer Relationships [Member]
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| All intangible assets and liabilities | 5 years 9 months 18 days | |
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Below-Market Leases [Member]
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| Acquired Finite-Lived Intangible Assets [Line Items] | ||
| All intangible assets and liabilities | 9 months 18 days | |