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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
	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

X

- 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

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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

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Exercisable

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- Definition

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options received in period.

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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.

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