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Restricted Share Grants - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Sep. 05, 2014
May. 28, 2013
Feb. 28, 2013
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 21, 2013
Feb. 01, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Non-cash compensation expense           $ 1,331,000    
Restricted Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Non-cash compensation expense       $ 917,000   $ 1,331,000    
Shares issued 10,000       591,250      
Shares outstanding         591,250      
Shares vested         8,750      
Long Term Incentive 2007 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Initial restricted shares issued   500,000 100,000          
Long Term Incentive 2007 Plan [Member] | Restricted Shares [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized for issuance             1,000,000 600,000
Increase in shares issuable by shareholders               500,000