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Stockholders' Equity - Additional Information (Detail) (USD $)
3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Common Stock Redemption
Mar. 31, 2013
Common Stock Redemption
May 01, 2014
Subsequent Event
Apr. 01, 2014
Subsequent Event
Apr. 30, 2014
Subsequent Event
Common Stock Redemption
Mar. 31, 2014
Reinvestment Plan
Dec. 31, 2013
Reinvestment Plan
Stockholders Equity [Line Items]                      
Aggregate offering proceeds received from public offering $ 659,100,000     $ 568,900,000           $ 12,700,000 $ 9,400,000
Remaining common stock available for sale and under Reinvestment plan 65,900,000     57,000,000           1,300,000 1,000,000
Cash distribution declared 6,147,000 2,100,000 14,170,000                
Stock distributions, shares 454,950 157,449         0.0025 0.0025      
Percentage of cash distribution considered taxable 20.00%                    
Percentage of cash distribution considered as return of capital 80.00% 100.00%                  
Amounts distributed to stockholders 0 0                  
Redemption of common stock, shares         28,343 23,565          
Redemption of common stock, per share         $ 9.13 $ 9.30          
Redemptions of common stock 258,000   827,000   300,000 200,000          
Redemption of shares paid                 $ 200,000