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Earnings Per Share ("EPS") - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Adjustments to net income (loss) for calculating basic EPS | $ 0 | $ 0
Adjustments to net income (loss) for calculating diluted EPS | $ 0 | $ 0
Restricted Stock And Performance Based Equity Awards [Member] | Outstanding Options [Member] |  |
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] |  |
Outstanding awards and options not included in diluted earnings per share | 122,678 | 1,019,185

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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 Amount of undistributed earnings (loss) from continuing operations allocated to participating securities for basic earnings (loss) per share or per unit calculation under two-class method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2814-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 65 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2793-109256 + Details
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