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Segment Information - Summary of Financial Information Relating to Reportable Segments (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Merger related transaction costs $ 17,960us-gaap_BusinessCombinationIntegrationRelatedCosts    
Restructuring charges 10,543us-gaap_RestructuringCharges 10,938us-gaap_RestructuringCharges 2,460us-gaap_RestructuringCharges
Corporate [Member]      
Segment Reporting Information [Line Items]      
Merger related transaction costs 17,960us-gaap_BusinessCombinationIntegrationRelatedCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
   
Restructuring charges $ 5,500us-gaap_RestructuringCharges
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember