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Related Party Transactions - Additional Information (Detail) |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Dec. 13, 2017 $ / shares shares | Nov. 30, 2017 $ / shares shares | Nov. 17, 2017 $ / shares shares | Nov. 08, 2017 $ / shares shares | Aug. 16, 2017 $ / shares shares | May 09, 2017 $ / shares shares | Jan. 03, 2017 $ / shares shares | Dec. 29, 2016 $ / shares shares | Aug. 23, 2016 $ / shares shares | Dec. 08, 2015 $ / shares shares | Nov. 30, 2015 $ / shares shares | Aug. 11, 2015 $ / shares shares | Mar. 26, 2015 $ / shares shares | Dec. 31, 2017 USD ($) Lease | Dec. 31, 2016 USD ($) Lease $ / shares shares | Dec. 31, 2015 USD ($) Lease
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transactions number of property leased | Lease |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 2 | 2
Related party transaction lease expenses | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 300,000
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party transaction lease expenses | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |
Officers and Other Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares | shares |  |  | 7,975 | 24,874 |  |  |  |  |  |  |  |  |  |  | 7,703 |
Shares price per share | $ / shares |  |  | $ 74.51 | $ 71.07 |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days to be considered for average price of stock repurchased |  |  | 30 days | 30 days |  |  |  |  |  |  |  |  |  |  | 30 days |
Officers and Other Employees [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 42.10 |
Officers and Other Employees [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares price per share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45.20 |
Retired Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares | shares |  | 3,334 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares price per share | $ / shares |  | $ 75.37 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of trading days to be considered for average price of stock repurchased |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |
Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares | shares |  |  |  |  |  | 2,500 | 1,834 |  |  |  |  |  |  |  |  |
Shares price per share | $ / shares |  |  |  |  |  | $ 52.05 | $ 58.58 |  |  |  |  |  |  |  |  |
Number of trading days to be considered for average price of stock repurchased |  |  |  |  |  | 30 days | 30 days |  |  |  |  |  |  |  |  |
Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares | shares | 15,000 |  |  |  | 24,920 |  |  |  | 27,448 |  |  | 30,713 |  |  |  |
Shares price per share | $ / shares | $ 78.68 |  |  |  | $ 50.16 |  |  |  | $ 44.66 |  |  | $ 35.00 |  |  |  |
Number of trading days to be considered for average price of stock repurchased | 30 days |  |  |  | 30 days |  |  |  | 30 days |  |  | 30 days |  |  |  |
Robert G Ruhlman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of shares | shares |  |  |  | 7,000 |  |  |  | 5,000 |  | 1,510 | 1,479 |  | 1,290 |  |  |
Shares price per share | $ / shares |  |  |  | $ 71.07 |  |  |  | $ 56.38 |  | $ 40.83 | $ 41.50 |  | $ 45.39 |  |  |
Number of trading days to be considered for average price of stock repurchased |  |  |  | 30 days |  |  |  | 30 days |  | 30 days | 30 days |  | 30 days |  |  |
Ryan Ruhlman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation payment received | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 189,870
Ryan Ruhlman employee years of service |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 years
Compensation attributable to stock option | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33,725
X Information Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | $ 200,000 | 100,000
Flex Work Sp [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Labor expense | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | $ 400,000 | $ 400,000
Ownership percentage owned by related party |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Baker & Hostetler LLP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal fees | $ |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |

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