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Benefits Plan - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Cost Recognized $ 25,400 $ 25,800 $ 26,100
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined contribution benefit plans $ 11,658 12,718  
Minimum target allocation for plan asset of Fixed Income Securities 30.00%    
Maximum target allocation for plan asset of Fixed Income Securities 65.00%    
Defined benefit plan narrative description .04    
Defined benefit plans that will be amortized from AOCI into net periodic benefit cost $ 8,200    
Percentage of Total Plan Assets Categorized As Level One 81.00%    
Expected contributions to defined benefit pension plans in 2012 $ 11,400    
Foreign Pension Plan, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan narrative description .04    
Other Postretirement Benefit Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Contributions to defined contribution benefit plans $ 245 $ 283  
Postretirement Medical Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Expected contributions to defined benefit pension plans in 2012 $ 600    
Equity Securities | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation for plan asset of Equity Securites 30.00%    
Maximum target allocation for plan asset of Equity Securities 65.00%    
Real Estate Investment [Member] | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation for plan asset of Equity Securites 0.00%    
Maximum target allocation for plan asset of Equity Securities 15.00%    
Other Investments | Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Minimum target allocation for plan asset of Equity Securites 0.00%    
Maximum target allocation for plan asset of Equity Securities 25.00%