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Share Based Compensation Plan - Summary of Performance base restricted share unit activity (Detail) - Performance-Based Restricted Share Unit [Member]	6 Months Ended
	Jun. 30, 2020 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Number of Performance-based Restricted Share Units, Beginning balance | shares	739,000
Number of Performance-based Restricted Share Units, Granted | shares	10,000
Number of Performance-based Restricted Share Units, Received | shares	(10,000)
Number of Performance-based Restricted Share Units, Forfeited/expired | shares	(54,000)
Number of Performance-based Restricted Share Units, Ending balance | shares	685,000
Number of Performance-based Restricted Share Units, Exercisable | shares	30,000
Weighted Average Grant Date Fair Value, Beginning balance | $ / shares	$ 7.92
Weighted Average Grant Date Fair Value, Granted | $ / shares	7.16
Weighted Average Grant Date Fair Value, Received | $ / shares	7.16
Weighted Average Grant Date Fair Value, Forfeited/expired | $ / shares	8.09
Weighted Average Grant Date Fair Value, Ending balance | $ / shares	7.91
Weighted Average Grant Date Fair Value, Exercisable | $ / shares	$ 12.87

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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

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-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.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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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.

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