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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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| Finite-Lived Intangible Assets [Line Items] | ||
| Period for intangible assets and liabilities | 9 years 10 months 24 days | 12 years 1 month 6 days |
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In-place Leases [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||
| Period for intangible assets and liabilities | 8 years 9 months 18 days | 10 years 8 months 12 days |
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Leasing Costs [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||
| Period for intangible assets and liabilities | 8 years 9 months 18 days | 10 years 8 months 12 days |
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Customer Relationships [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||
| Period for intangible assets and liabilities | 13 years 6 months | 15 years 1 month 6 days |
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Above Market Leases [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||
| Period for intangible assets and liabilities | 8 years 9 months 18 days | 10 years 1 month 6 days |
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Below Market Leases [Member]
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| Finite-Lived Intangible Assets [Line Items] | ||
| Period for intangible assets and liabilities | 7 years 2 months 12 days | 11 years 3 months 18 days |