(Loss) Earnings per Share - Additional Information (Detail) - shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Line Items]
Anti-dilutive shares of common stock excluded from the computation of diluted (loss) earnings per share			1,879,000
Potentially dilutive shares of common stock excluded from the computation of diluted loss per share	5,090,000	4,807,000
Shares included in calculation of diluted (loss) earnings per share			121,000
Performance-vesting Restricted Share [Member]
Earnings Per Share [Line Items]
Shares included in calculation of diluted (loss) earnings per share	78,000	13,000	19,000

Earnings Per Share Line Items

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- Definition

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

+ 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/presentationRef
-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/2003/role/presentationRef
-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

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