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Related Party Transactions - Additional Information (Detail)
 12 Months Ended
Dec. 08, 2015
$ / shares
shares
Nov. 30, 2015
$ / shares
shares
Aug. 11, 2015
$ / shares
shares
Mar. 26, 2015
$ / shares
shares
Aug. 14, 2014
$ / shares
shares
Mar. 20, 2014
$ / shares
shares
Nov. 12, 2013
$ / shares
shares
May. 09, 2013
$ / shares
shares
May. 08, 2013
$ / shares
shares
Dec. 31, 2015
USD ($)
Property
Lease
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
shares
Related Party Transaction [Line Items]                        
Purchase of common shares                   198,589 40,145 89,807
Related party transactions number of property leased | Lease                   2    
Related party transaction lease expenses | $                   $ 300,000 $ 300,000 $ 300,000
Related party transactions number of property rented | Property                   2    
Rent Expenses | $                   $ 200,000 200,000 300,000
Robert G Ruhlman [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares 1,510 1,479   1,290   2,098 25,000          
Common shares price per share | $ / shares $ 40.83 $ 41.50   $ 45.39   $ 62.99 $ 78.91          
Number of trading days to be considered for average price of stock repurchased 30 days 30 days 30 days 30 days   30 days 30 days          
Trust [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares     30,713   34,106              
Common shares price per share | $ / shares     $ 35.00   $ 54.83              
Ryan Ruhlman [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares             3,200   2,500      
Common shares price per share | $ / shares             $ 78.91   $ 76.98      
Number of trading days to be considered for average price of stock repurchased             30 days   30 days      
Compensation payment received | $                   $ 189,870 153,273  
Ryan Ruhlman employee years of service                   11 years    
Compensation attributable to stock option | $                   $ 33,725 39,100  
David C Sunkle [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares             1,000   3,000      
Common shares price per share | $ / shares             $ 78.91   $ 76.98      
Number of trading days to be considered for average price of stock repurchased             30 days   30 days      
Ruhlman [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares               9,757        
Common shares price per share | $ / shares               $ 76.87        
Dennis F Mckenna [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares             2,750          
Common shares price per share | $ / shares             $ 78.91          
Number of trading days to be considered for average price of stock repurchased             30 days          
J Cecil Curlee [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares             2,500          
Common shares price per share | $ / shares             $ 78.91          
Number of trading days to be considered for average price of stock repurchased             30 days          
Caroline S Vaccariello [Member]                        
Related Party Transaction [Line Items]                        
Purchase of common shares             1,750          
Common shares price per share | $ / shares             $ 78.91          
Number of trading days to be considered for average price of stock repurchased             30 days          
Flex Work Sp [Member]                        
Related Party Transaction [Line Items]                        
Labor expense | $                   $ 400,000 500,000 300,000
Ownership percentage owned by related party                   50.00%    
X Information Technology [Member]                        
Related Party Transaction [Line Items]                        
Service expense | $                   $ 200,000 $ 100,000 $ 100,000