Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
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	$ 23,500,000	$ 29,400,000	$ 7,500,000
Amount of domestic income (loss) before income taxes	(1,400,000)	7,100,000	$ (20,900,000)
U.S federal NOLs	60,000,000
U.S. state NOLs	113,500,000
U.S. federal and state capital loss carryforwards	$ 8,100,000
U.S. federal and state NOLs, expiration period	Between 2021 and 2035
U.S. federal and state capital loss, expiration year	2022
U.S federal alternative minimum tax credits carry forward	$ 300,000
Foreign NOLs	$ 13,300,000
Cumulative pre-tax loss position period	3 years
Valuation allowance	$ 15,975,000	$ 23,005,000
Uncertain tax position liabilities and related interest or penalties	0
Valuation Allowance of Deferred Tax Assets [Member]
Income Taxes [Line Items]
Valuation allowance	4,000,000
Valuation Allowance of Deferred Tax Assets Foreign [Member]
Income Taxes [Line Items]
Valuation allowance	2,200,000
Valuation Allowance of Deferred Tax Assets Foreign [Member] | Current Year Earnings [Member]
Income Taxes [Line Items]
Valuation allowance	$ 2,000,000