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Related Party Transactions - Additional Information (Detail)																					12 Months Ended
	Dec. 19, 2019 $ / shares shares	Dec. 12, 2019 $ / shares shares	Jul. 02, 2019 $ / shares shares	Feb. 06, 2019 $ / shares shares	Dec. 18, 2018 $ / shares shares	Sep. 14, 2018 $ / shares shares	Aug. 23, 2018 $ / shares shares	Aug. 07, 2018 $ / shares shares	Jun. 15, 2018 $ / shares shares	Jun. 01, 2018 $ / shares shares	May 10, 2018 $ / shares shares	Mar. 15, 2018 $ / shares shares	Feb. 06, 2018 $ / shares shares	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. 31, 2019 USD ($) Lease Employee	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Related Party Transaction [Line Items]
Related party transactions number of property leased | Lease																					1
Related party transaction lease expenses | $																					$ 0	$ 0
Loan amount due | $																					$ 57,076,000	26,408,000
Austrian Subsidiary [Member]
Related Party Transaction [Line Items]
Interest rate																					3.00%
Loan amount due | $																					$ 100,000
Debt instrument expiration year																					2025
Related party transaction lease expenses paid | $																					$ 100,000
Czech Republic Subsidiary [Member]
Related Party Transaction [Line Items]
Related party transaction lease expenses paid | $																					$ 200,000
Related party transaction lease expiration term																					5 years
Number of employees | Employee																					2
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														21,650		7,975	24,874
Shares price per share | $ / shares														$ 78.68		$ 74.51	$ 71.07
Number of trading days to be considered for average price of stock repurchased														30 days		30 days	30 days
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
Randall M. Ruhlman [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares														7,500
Shares price per share | $ / shares														$ 78.68
Number of trading days to be considered for average price of stock repurchased														30 days
Current Officers and Retired Officer [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares				36,413				17,141					7,877
Shares price per share | $ / shares				$ 56.44				$ 87.19					$ 80.20
Number of trading days to be considered for average price of stock repurchased				30 days				30 days					30 days
Retired Officer [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares	6,326		952		35					8,800
Shares price per share | $ / shares	$ 71.75		$ 51.20		$ 57.85					$ 73.53
Number of trading days to be considered for average price of stock repurchased	30 days		30 days		30 days					30 days
Officer [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares		20,862				7,500			1,500		3,200	1,430							2,500	1,834
Shares price per share | $ / shares		$ 70.39				$ 80.95			$ 77.06		$ 68.10	$ 63.63							$ 52.05	$ 58.58
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	30 days
Employee [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares							2,000
Shares price per share | $ / shares							$ 83.53
Number of trading days to be considered for average price of stock repurchased							30 days
Trust [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares														15,000				24,920
Shares price per share | $ / shares														$ 78.68				$ 50.16
Number of trading days to be considered for average price of stock repurchased														30 days				30 days
Robert G Ruhlman [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares																	7,000
Shares price per share | $ / shares																	$ 71.07
Number of trading days to be considered for average price of stock repurchased																	30 days
X Information Technology [Member]
Related Party Transaction [Line Items]
Service expense | $																					$ 100,000	200,000	200,000
Baker & Hostetler LLP [Member]
Related Party Transaction [Line Items]
Legal fees | $																					$ 100,000	$ 100,000	$ 100,000

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