Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended							9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Internal Revenue Service [Member]	Dec. 31, 2013 Capital Loss Carryforwards Expiring 2014 [Member]	Dec. 31, 2013 Capital Loss Carryforwards Expiring 2015 [Member]	Dec. 31, 2013 Capital Loss Carryforwards Expiring 2016 or Later [Member]	Sep. 30, 2014 Earliest Tax Year [Member]	Sep. 30, 2014 Latest Tax Year [Member]	May 31, 2013 Class A Common Stock [Member]
Tax Credit Carryforward [Line Items]
Annual distribution of net taxable income for U.S. federal income tax not to apply to our earnings that we distribute (percent)			90.00%
Net taxable income subject to distribution (percent)			100.00%
Excise tax rate			4.00%
Income tax provision	$ (118,000)	$ (264,000)	$ 412,000	$ 329,000
Income tax provision related to REIT subsidiaries			219,000
Income tax provision related to uncertain tax position			124,000
Income tax provision related to other items			69,000
Deferred tax assets	0		0		0
Deferred tax liabilities	0		0		0
Common stock, shares issued	57,194,000		57,194,000		28,802,000							25,875,000
Net operating losses carried forward					159,000,000
Net capital losses carried forward					41,500,000		9,500,000	31,400,000	602,000
NOLs expiration date			Expire in 2029
Net operating losses and net capital losses						$ 2,000,000
Open tax year										2010	2013