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Defined Benefit Plans - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
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 11 months 10.7  
Recognition of actuarial (losses) gains $ (0.9) $ (0.9)
Prior service credits amortization period 11 months