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Borrowings - Fair Value of Debt (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Fair Value Measurements [Line Items]    
Fair value of debt $ 1,480,028us-gaap_LongTermDebtFairValue $ 1,548,102us-gaap_LongTermDebtFairValue
Level 1    
Fair Value Measurements [Line Items]    
Fair value of debt 1,024,806us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 899,390us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 2    
Fair Value Measurements [Line Items]    
Fair value of debt $ 455,222us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 648,712us-gaap_LongTermDebtFairValue
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member