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Deferred Compensation Plan - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Dividend Declared [Member]
Dec. 31, 2012
Dividend Declared [Member]
Feb. 28, 2013
Class A Redeemable Common Shares [Member]
Dec. 31, 2013
Class B Redeemable Common Shares [Member]
Mar. 31, 2012
Class B Redeemable Common Shares [Member]
Dec. 31, 2013
Stock Compensation Plan [Member]
Directors and Key Employees [Member]
Dec. 31, 2012
Stock Compensation Plan [Member]
Directors and Key Employees [Member]
Dec. 31, 2013
Stock Compensation Plan [Member]
Long Term Incentive Plan [Member]
Dec. 31, 2012
Stock Compensation Plan [Member]
Long Term Incentive Plan [Member]
Dec. 31, 2013
Deferred Share and Phantom Shares [Member]
Dec. 31, 2012
Deferred Share and Phantom Shares [Member]
Dec. 31, 2011
Deferred Share and Phantom Shares [Member]
Dec. 31, 2013
Director Fees and Employee Compensation [Member]
Dec. 31, 2012
Director Fees and Employee Compensation [Member]
Dec. 31, 2011
Director Fees and Employee Compensation [Member]
Dec. 31, 2013
Non Employee [Member]
Dec. 31, 2013
Key Employee Awards [Member]
Dec. 31, 2013
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                          
Deferred director fees and deferred employee compensation                         $ 616,000 $ 466,000 $ 288,000 $ 67,000 $ 88,000 $ 60,000      
Percentage of director's award vest on meets certain attendance requirements 100.00%                                        
Percentage of key employee awards vest in year one following grant date 10.00%                                        
Percentage of key employee awards vest in year two following grant date 20.00%                                        
Percentage of key employee awards vest in year three following grant date 30.00%                                        
Percentage of key employee awards vest in year four following grant date 40.00%                                        
Non vested awards                 165 168 480 368                  
Percentage of long-term incentive compensation program over three year period                                         45.00%
Deferred compensation expense with tax benefit                         209,000 158,000 98,000            
Unrecognized compensation cost related to non-vested award compensation 399,000                                        
Weighted average period to recognize unrecognized compensation cost related to non-vested award compensation 1 year 5 months 16 days                                        
Dividend declared per share           $ 32.60   $ 21.00                          
Increase in deferred compensation liability 675,195 542,630 225,551 52,000 28,000                                
Weighted average grant date fair value of awards granted $ 957 $ 743                                      
Deferred compensation liability $ 2,063,000 $ 1,613,000                                      
Expected fair value of deferred compensation awards calculation Three year historical average trend rate of the book value per redeemable common share over the respective vesting period.                                        
Maximum aggregate number of share based awards             15,000                            
Total number of share based awards                                     252 204  
Number of forfeited shares award 2,740