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Net Income Per Share - Reconciliation of Common Shares Used for Basic and Diluted Earnings Per Share (Detail) | 8 Months Ended | 12 Months Ended | 4 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2014 | Apr. 30, 2013 | Dec. 31, 2012
Successor [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average number of common shares used for basic earnings per share | 45,003,925 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 45,093,304 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Effect of potential dilutive shares: |  |  |  |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share | 46,302,734 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 46,933,253 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Successor [Member] | Employee Stock Option [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Anti-dilutive shares excluded from reconciliation | 855 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |  |
Successor [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 1,189 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 37,812 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Successor [Member] | Performance Shares [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_PerformanceSharesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 5,526 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_PerformanceSharesMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Successor [Member] | Warrants [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 1,297,620 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 1,786,804 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Successor [Member] | Employee Stock Option [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember | 9,807 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_SuccessorMember |  |
Predecessor [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Weighted average number of common shares used for basic earnings per share |  |  | 302,469,544 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 302,468,867 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Effect of potential dilutive shares: |  |  |  |
Weighted average number of common shares and potential dilutive shares used for diluted earnings per share |  |  | 302,579,245 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 302,468,867 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | Employee Stock Option [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Anti-dilutive shares excluded from reconciliation |  |  | 475,550 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 805,999 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares |  |  | 109,701 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Anti-dilutive shares excluded from reconciliation |  |  |  | 71,295 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | Performance Shares [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares |  |  | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_PerformanceSharesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_PerformanceSharesMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | Warrants [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares |  |  | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Predecessor [Member] | Employee Stock Option [Member] |  |  |  |
Effect of potential dilutive shares: |  |  |  |
Effect of potential dilutive shares |  |  | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember | 0 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment / us-gaap_StatementEquityComponentsAxis = us-gaap_EmployeeStockOptionMember / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

X
- 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: 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 4: 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 + 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 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: 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=7655603&loc=d3e1505-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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