Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended								6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 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]	May 31, 2013 Class A Common Stock [Member]	Jun. 30, 2014 Minimum [Member]	Jun. 30, 2014 Maximum [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	$ (2,000)	$ 554,000	$ 530,000	$ 593,000
Income tax provision related to REIT subsidiaries			342,000	554,000
Income tax provision related to uncertain tax position			124,000
Income tax provision related to other items			64,000	39,000
Deferred tax assets	0		0		0
Deferred tax liabilities	0		0		0
Common stock, shares issued	47,935,000		47,935,000		28,802,000					25,875,000
Net operating losses carried forward					161,500,000
Net capital losses carried forward					39,200,000		7,000,000	31,400,000	782,000
NOLs expiration date			Expire in 2029
Net operating losses and net capital losses						$ 2,000,000
Open tax year											2010	2013