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Retirement Benefit Plans - Components of Net Periodic Benefit Cost (Parenthetical) (Detail) - Pension Benefits [Member]
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2013
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]    
Rate of compensation increase   4.00%
Age Twenty [Member]    
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]    
Rate of compensation increase 7.00%  
Age Sixty [Member]    
Defined Benefit Plan Net Periodic Benefit Cost [Line Items]    
Rate of compensation increase 2.00%