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Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) - Successor [Member] - shares | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average number of common shares used for basic earnings per share | 45,683,058 | 45,369,213 | 45,577,656 | 45,330,946
Effect of potential dilutive shares: |  |  |  |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 46,472,375 | 45,773,509 | 46,097,647 | 45,330,946
Warrants [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0 | 0 | 4,053,670
Employee Stock Option [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 126,667 | 126,667 | 126,667 | 126,667
Restricted Stock Units (RSUs) [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 0 | 5,362 | 68,654
Performance Shares [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 0 | 151,527 | 0 | 342,092
Warrants [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 392,772 | 250,289 | 196,386 | 0
Restricted Stock Units (RSUs) [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 70,498 | 27,609 | 54,720 | 0
Performance Shares [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 326,047 | 126,398 | 268,885 | 0

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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 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. + References No definition available. + 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 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 Reference 2: 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 + Details
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