Quarterly report pursuant to Section 13 or 15(d)

Equity - Schedule of Common Stock Public Offerings (Detail)

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Equity - Schedule of Common Stock Public Offerings (Detail) (USD $)
9 Months Ended
Apr. 23, 2013
Sep. 30, 2014
4/23/2013 Closing Date [Member]
Sep. 30, 2014
4/29/2014 Closing Date [Member]
Sep. 30, 2014
10/27/2014 Closing Date [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Public offerings of common stock, Closing Date   Apr. 23, 2013 Apr. 29, 2014 Oct. 27, 2014
Public offerings of common stock, Shares Issued   14,152 5,750 4,600
Public offerings of common stock, Price Per Share $ 12.50 $ 12.50 $ 13.00 $ 13.60
Public offerings of common stock, Net Proceeds   $ 160,000 $ 70,400 $ 58,900