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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average number of common shares used for basic earnings per share | 45,174,521 | 45,115,882 | 45,173,671 | 45,083,831
Effect of potential dilutive shares: |  |  |  |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 45,174,521 | 46,624,689 | 46,352,214 | 47,027,084
Restricted Stock Units (RSUs) [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 0 | 31,384 | 14,418 | 40,473
Performance Shares [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 0 | 0 | 2,729 | 0
Warrants [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 0 | 1,469,203 | 1,154,313 | 1,892,211
Anti-dilutive shares excluded from reconciliation | 4,461,637 |  |  |
Employee Stock Option [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 0 | 8,220 | 7,083 | 10,569
Anti-dilutive shares excluded from reconciliation | 176,668 |  | 110,000 |

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