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Share-based compensation - Summary of Weighted Average Assumptions of RPSU Plan Units Under Equity Method (Detail) - Restricted share unit plan [member] - $ / shares | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Average fair value of units granted (per unit) | $ 0.55 | $ 2.77
Expected life of units (years) | 3 Years | 3 Years
Expected forfeiture rate | 0.60% | 1.00%

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Description of expected forfeiture rate other equity instruments granted. + References No definition available. + Details
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Namespace Prefix: | obe_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Description of units life share other equity instruments granted. + References No definition available. + Details
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Namespace Prefix: | obe_
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Balance Type: | na
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- Definition Weighted average share price of other equity instruments granted. + References No definition available. + Details
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Namespace Prefix: | obe_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Details
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Data Type: | na
Balance Type: |
Period Type: |