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Related Party Transactions - Additional Information (Detail)																	12 Months Ended
	Dec. 15, 2020 $ / shares shares	Feb. 05, 2020 $ / shares shares	Jan. 02, 2020 $ / shares shares	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. 31, 2020 USD ($) Employee	Dec. 31, 2019 USD ($) Employee	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Loan amount due																	$ 38,549,000	$ 57,076,000
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																	$ 200,000	100,000
Czech Republic Subsidiary [Member]
Related Party Transaction [Line Items]
Related party transaction lease expenses paid																	$ 200,000	$ 200,000
Related party transaction lease expiration term																	5 years	5 years
Number of employees | Employee																	2	2
Retired Officer [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares			1,157	6,326		952		35					8,800
Shares price per share | $ / shares			$ 67.71	$ 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					30 days
Current Officers and Retired Officer [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares		39,208					36,413				17,141					7,877
Shares price per share | $ / shares		$ 58.65					$ 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					30 days
Officer [Member]
Related Party Transaction [Line Items]
Purchase of shares | shares	19,900				20,862				7,500			1,500		3,200	1,430
Shares price per share | $ / shares	$ 62.71				$ 70.39				$ 80.95			$ 77.06		$ 68.10	$ 63.63
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
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
X Information Technology [Member]
Related Party Transaction [Line Items]
Service expense																	$ 0	$ 100,000	$ 200,000
Baker & Hostetler LLP [Member]
Related Party Transaction [Line Items]
Legal fees																	$ 100,000	$ 100,000	$ 100,000

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