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Employee Share Plans - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
May 09, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Holding period of stock |  | 1 year |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Method Used |  | Black-Scholes-Merton option-pricing model |  |
Fair value of stock options granted |  |  | $ 4.73 | $ 3.49
Restricted Stock Awards [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Compensation cost for non-vested stock options weighted average period |  | 1 year 7 days |  |
Unrecognized compensation cost for restricted stock awards |  | $ 10,300,000 |  |
Total fair value of shares vested during period |  | 3,900,000 | $ 4,100,000 | $ 3,400,000
Market value of shares awarded during period |  | $ 4,500,000 | $ 5,100,000 | $ 4,400,000
Performance Shares [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period |  | 3 years |  |
Share-based compensation arrangement by share-based payment award, remaining contractual terms |  | 3 years |  |
Achievement of an earnings per share target |  | 70.00% |  |
Achievement of total growth in revenue |  | 30.00% |  |
2019 Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share available for future grant | 3,100,000 |  |  |
Stock awards expiry | 2029 |  |  |
2014 Stock Incentive Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Share available for future grant |  | 2,200,000 |  |
Employee Stock Purchase Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Termination date of the Employee Stock Purchase Plan |  | Jun. 30, 2022 |  |
Price an employee pays for shares as percentage of fair market value |  | 85.00% |  |
Stock Option [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Percentage of incremental vesting schedule |  |  | 25.00% | 25.00%
Incremental vesting schedule period |  |  | 4 years |
Stock options expiry date |  | 6 years |  |
Options awarded under the plans vesting period |  | 4 years |  |
Weighted-average grant-date fair value of stock options granted |  |  | $ 3,000,000.0 | $ 2,300,000
Aggregate intrinsic value of stock options exercised |  | $ 18,800,000 | $ 10,900,000 | $ 9,400,000
Unrecognized compensation cost for non-vested stock option |  | $ 3,800,000 |  |
Compensation cost for non-vested stock options weighted average period |  | 1 year 10 days |  |
Maximum [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Shares purchased under ESPP |  | 2,000,000 |  |
Options awarded under the plans vesting period |  | 4 years |  |
Maximum [Member] | Restricted Stock Awards [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period |  | 4 years |  |
Restricted stock outstanding release from restriction period range |  | 2022-05 |  |
Maximum [Member] | Performance Shares [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Percentage of initial grant |  | 200.00% |  |
Maximum [Member] | Employee Stock Purchase Plan [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
ESPP allows qualified employees to purchase shares of common stock |  | $ 25,000 |  |
Minimum [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period |  | 3 years |  |
Minimum [Member] | Restricted Stock Awards [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period |  | 1 year |  |
Restricted stock outstanding release from restriction period range |  | 2020-02 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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