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Components of Income Tax Expense (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Components Of Income Tax Expense Benefit [Line Items]        
Deferred $ 14,234us-gaap_DeferredIncomeTaxExpenseBenefit      
Total income tax expense 14,234us-gaap_IncomeTaxExpenseBenefit      
Predecessor        
Components Of Income Tax Expense Benefit [Line Items]        
Current   914us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
3,902us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
4,145us-gaap_CurrentIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Deferred   8us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
(77)us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
128us-gaap_DeferredIncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
Total income tax expense   $ 922us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 3,825us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember
$ 4,273us-gaap_IncomeTaxExpenseBenefit
/ us-gaap_StatementScenarioAxis
= us-gaap_PredecessorMember