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Interest Expense (Income) - Schedule of Components of Net Interest Expense (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Interest Revenue (Expense), Net [Abstract]      
Interest expense $ 174,142us-gaap_InterestExpense $ 151,986us-gaap_InterestExpense $ 173,503us-gaap_InterestExpense
Interest income (4,886)us-gaap_InvestmentIncomeInterest (5,091)us-gaap_InvestmentIncomeInterest (11,128)us-gaap_InvestmentIncomeInterest
Interest expense, net $ 169,256us-gaap_InterestRevenueExpenseNet $ 146,895us-gaap_InterestRevenueExpenseNet $ 162,375us-gaap_InterestRevenueExpenseNet