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Related Party Transactions - Additional Information (Detail) |  |  |  |  |  |  |  |  |  | 12 Months Ended
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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

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