(Loss) Earnings per Share - Additional Information (Detail) - shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Line Items]
Potentially dilutive securities excluded from computation of earnings per share	2,253,000
Anti-dilutive or potentially dilutive shares excluded from the computation of diluted (loss) earnings per share		305,000	1,299,000
Shares included in calculation of diluted earnings (loss) per share		735,000	740,000
Performance-vesting Restricted Awards [Member]
Earnings Per Share [Line Items]
Shares included in calculation of diluted earnings (loss) per share		247,000	364,000

Earnings Per Share Line Items

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- Definition

Potentially dilutive securities excluded from computation of earnings per share amount.

+ References

No definition available.

+ Details

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

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