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Investment in Real Estate - Summary Regarding Industrial Properties Included in Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Real Estate [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 7,007 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 20,727 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue | $ 31,457 us-gaap_DisposalGroupIncludingDiscontinuedOperationRevenue
Property Expenses |  |  |  |  |  |  |  |  | (2,784)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | (8,126)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense | (12,269)us-gaap_DisposalGroupIncludingDiscontinuedOperationOperatingExpense
Impairment of Real Estate |  |  |  |  |  |  |  |  | 0 us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense | (2,652)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense | (1,438)us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherExpense
Depreciation and Amortization |  |  |  |  |  |  |  |  | (2,388)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization | (7,727)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization | (11,648)us-gaap_DisposalGroupIncludingDiscontinuedOperationDepreciationAndAmortization
Gain on Sale of Real Estate |  |  |  |  |  |  |  |  | 25,988 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 34,344 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax | 12,665 us-gaap_DiscontinuedOperationGainLossFromDisposalOfDiscontinuedOperationBeforeIncomeTax
Income from Discontinued Operations | $ 11,698 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 13,932 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 1,052 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 1,141 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 19,850 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 5,303 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 13,011 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ (1,598)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 27,823 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 36,566 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | $ 18,767 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax

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- Definition Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of depreciation and amortization attributable to disposal group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of operating expenses attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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