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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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- Definition Share based compensation arrangement by share based payment award options exercisable weighted average grant date fair value. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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