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Pension Benefits - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Cost recognized for defined contribution pension plans $ 14.8 $ 14.5 $ 18.3
Accumulated benefit obligation 116.1 115.0  
Estimations of contributions into benefit plan during 2014 $ 11.2    
NORWAY
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of ownership of defined benefit pension assets 71.00%    
AUSTRALIA
     
Defined Benefit Plan Disclosure [Line Items]      
Percentage of ownership of defined benefit pension assets 29.00%