Net Income (Loss) Per Share - Additional Information (Detail) - shares shares in Thousands	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Restricted stock
Earnings Per Share [Line Items]
Exercisable options outstanding that enable to purchase shares	76	257
Shares with dilutive effect and included in computation of diluted income (loss) per share	21
Options excluded from computation of diluted income (loss) per share due to anti-dilutive effect	93
Equity option
Earnings Per Share [Line Items]
Exercisable options outstanding that enable to purchase shares		825
Shares with dilutive effect and included in computation of diluted income (loss) per share		276
Options excluded from computation of diluted income (loss) per share due to anti-dilutive effect	120	260

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

Reference 4: 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration