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Net Income Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2015 | Sep. 30, 2014 | Dec. 31, 2014 | Apr. 30, 2013
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |
Number of new common stock issued | 45,036,587 | 45,036,587 |  | 45,005,932 |
Par value of common stock issued | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 5,047,138
Exercise price of common stock |  |  |  |  | $ 16.67
Investment Warrants Expiration Date |  |  |  | Apr. 30, 2023 |
Common stock shares issued |  | 236 | 949 |  |
Warrant exercised |  | 740 | 949 |  |
Successor [Member] |  |  |  |  |
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |
Number of new common stock issued |  |  |  |  | 45,000,000
WarrantBuyBackAuthorizedDollars |  | $ 10,000 |  |  |
Warrants Purchased During Period Shares |  | 577,500 |  |  |
Warrants Purchased During Period Dollars |  | $ 5,017 | $ 0 |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights |  |  |  |  | 5,047,138
Warrants outstanding | 4,461,637 | 4,461,637 |  |  |
Employee Stock Option [Member] | Successor [Member] |  |  |  |  |
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 176,668 | 110,000 |  |  |
Warrants [Member] | Successor [Member] |  |  |  |  |
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 4,461,637 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Successor [Member] |  |  |  |  |
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 78,460 |  |  |  |
Performance Shares [Member] | Successor [Member] |  |  |  |  |
Schedule Of Earnings Per Share [Line Items] |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 96,349 |  |  |  |

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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 -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 + Details
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