Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014
Summary Of Significant Accounting Policies [Line Items]
Deferred financing costs	$ 0.6
Maximum period for reimbursement of offering cost	60 days
Maximum offering cost rate	3.50%
Minimum percentage of ordinary taxable income to be distributed to stockholders	90.00%
Minimum | Personal Property
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	3 years
Maximum | Personal Property
Summary Of Significant Accounting Policies [Line Items]
Estimated useful life	5 years