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Pension Benefits - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Cost recognized for defined contribution pension plans $ 15.2 $ 13.9 $ 14.8
Accumulated benefit obligation 67.1 $ 95.7  
Estimations of contributions into benefit plan during 2016 $ 4.9    
NORWAY [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of ownership of defined benefit pension assets 71.00%    
AUSTRALIA [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of ownership of defined benefit pension assets 29.00%