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Shareholders' Equity and Share Based Compensation - Summary of Performance base restricted share unit activity (Detail) - Performance-Based Restricted Share Unit [Member] | 9 Months Ended
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Sep. 30, 2021 $ / shares shares
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items] |
Number of Performance-based Restricted Share Units, Beginning balance | shares | 869,000
Number of Performance-based Restricted Share Units, Received | shares | (370,000)
Number of Performance-based Restricted Share Units, Ending balance | shares | 499,000
Number of Performance-based Restricted Share Units, Exercisable | shares | 114,000
Weighted Average Grant Date Fair Value, Beginning balance | $ / shares | $ 7.51
Weighted Average Grant Date Fair Value, Received | $ / shares | 6.94
Weighted Average Grant Date Fair Value, Ending balance | $ / shares | 7.93
Weighted Average Grant Date Fair Value, Exercisable | $ / shares | $ 7.97

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit 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 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable + References No definition available. + Details
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- Definition Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options received in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options received in period weighted average grant date fair value. + References No definition available. + Details
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- Details
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