Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Percentage of ordinary taxable income to be distributed for real estate investment trust qualification	90.00%	90.00%	90.00%
Percentage of taxable income to be distributed for federal income tax assumption	100.00%
Amount of foreign loss before income taxes	$ 7.5	$ 12.9
Amount of domestic loss before income taxes	20.9	7.6	0.1
U.S federal NOLs	50.7
U.S. state NOLs	121.8
Foreign NOLs	6.7
U.S. federal and state NOLs, expiration period	2021 through 2034
U.S federal alternative minimum tax credits carry forward	0.1
Increased Valuation Allowances [Member]
Income Taxes [Line Items]
Acquisition-related costs on consummated deals	$ 8.9

Acquisition-related costs on consummated deals

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Operating Loss Carryforward Expiration Date

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Percentage of ordinary taxable income to be distributed for REIT qualification.

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Percentage of taxable income to be distributed for federal income tax exemption.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible alternative minimum tax credit carryforwards.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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