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Defined Benefit Plans - Additional Information (Detail)
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Recognition of actuarial (losses) gains $ (0.9)
Postretirement Benefits [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Reduction in accrued retiree benefit plans (10.7)
Prior service credits amortized over the next 14 months 10.7
Recognition of actuarial (losses) gains $ (0.9)
Prior service credits amortization period 14 months