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Employer Share Plans - Additional Information (Detail) shares in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 $ / shares shares | Jun. 30, 2016 shares
Compensation And Retirement Disclosure [Abstract] |  |
Maximum stock based compensation awards granted under the plan | shares | 9.6 | 9.6
Stock awards expiry |  | 2024
Fair value of stock options granted | $ / shares | $ 2.40 |

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- Definition Share based compensation arrangement by share based payment award expiration year. + References No definition available. + Details
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- References No definition available. + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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