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Stock-based Payment Arrangements - Summary of Stock Option Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Options
Outstanding, Number of Option, Beginning Balance (shares)	352,370	408,478	484,688
Granted, Number of Options (shares)	37,780	28,790	28,290
Exercised, Number of Options (shares)	(198,786)	(83,348)	(103,240)
Forfeited, Number of Options (shares)	(10,834)	(1,550)	(1,260)
Outstanding, Number of Option, Ending Balance (shares)	180,530	352,370	408,478
Weighted Average Exercise Price [Abstract]
Outstanding, Weighted Average Exercise Price, Beginning Balance (in usd per share)	$ 19.78	$ 16.64	$ 14.55
Exercisable, Number of Options (shares)	86,401	258,319	315,912
Granted, Weighted-Average Exercise Price (in usd per share)	$ 35.78	$ 44.88	$ 35.25
Exercised, Weighted-Average Exercise Price (in usd per share)	12.52	12.90	11.73
Forfeited, Weighted-Average Exercise Price (in usd per share)	33.13	28.34	30.56
Outstanding, Weighted Average Exercise Price, Ending Balance (in usd per share)	30.32	19.78	16.64
Weighted- Average Grant Date Fair Value
Outstanding, Weighted-Average Grant Date Fair Value, Beginning Balance (in usd per share)	5.05	4.46	4.17
Granted, Weighted-Average Grant Date Fair Value (in usd per share)	6.52	10.35	7.14
Exercised, Weighted-Average Grant Date Fair Value (in usd per share)	3.85	3.99	3.81
Forfeited, Weighted-Average Grant Date Fair Value (in usd per share)	6.79	5.59	5.95
Outstanding, Weighted-Average Grant Date Fair Value, Ending Balance (in usd per share)	6.57	5.05	4.46
Exercisable, Weighted Average Exercise Price (in usd per share)	24.73	14.65	13.23
Exercisable, Weighted-Average Grant Date Fair Value (in usd per share)	$ 5.94	$ 4.27	$ 4.09
Outstanding, Weighted Average Remaining Contractual Term	6 years 7 months 6 days	3 years 7 months 6 days	3 years 8 months 12 days
Exercisable, Weighted Average Remaining Contractual Term	5 years 1 month 6 days	2 years	2 years 3 months 18 days

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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