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Common Share Options and Restricted Share Grants - Additional Information (Detail) - shares
12 Months Ended
May 28, 2013
Feb. 28, 2013
Dec. 31, 2016
May 31, 2013
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]            
Number of shares authorized for issuance       1,000,000    
Stock options issued     0      
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