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Related Party Transactions - Additional Information (Detail)														12 Months Ended
	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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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
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-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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