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Restricted Share Grants - Additional Information (Detail) - shares
6 Months Ended
May 28, 2013
Feb. 28, 2013
Jun. 30, 2016
May 21, 2013
Feb. 01, 2013
Restricted Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued     0    
Shares outstanding     0    
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