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Employee Share Plans - Additional Information (Detail) shares in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Maximum stock based compensation awards granted under the plan | 9.6
Stock awards expiry | 2024
Performance Shares [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Share-based compensation arrangement by share-based payment award, remaining contractual terms | 3 years
Performance share units, vesting period | 3 years
Achievement of an earnings per share target | 70.00%
Achievement of total growth in revenue | 30.00%
Percentage of initial grant | 200.00%

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- Definition Share based compensation arrangement by share based payment award equity instruments other than options percentage of target earnings per share. + References No definition available. + Details
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- Definition Share based compensation arrangements by share based payment award performance stock of total growth in revenue. + References No definition available. + Details
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- Definition Share based compensation arrangements by share based payment award performance stock percentage of initial grant. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, 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 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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