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Subsequent Events - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended
Jul. 31, 2015
Jul. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Subsequent Event [Line Items]        
Line of credit facility, amount outstanding     $ 95,000 $ 25,000
Revolving Credit Facility        
Subsequent Event [Line Items]        
Line of credit facility, amount outstanding     $ 95,000  
Subsequent Event | Revolving Credit Facility        
Subsequent Event [Line Items]        
Line of credit facility, amount outstanding   $ 88,000    
Repayment of unsecured revolving credit facility $ 7,000