Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Collective Bargaining Agreements) - Additional Information (Detail)

v3.7.0.1
Commitments and Contingencies (Collective Bargaining Agreements) - Additional Information (Detail) - Withdrawal from Multiemployer Defined Benefit Plan [Member] - Central States Plan [Member] - USD ($)
$ in Millions
 30 Months Ended 46 Months Ended
Mar. 13, 2013
Mar. 31, 2017
Mar. 31, 2017
Jan. 31, 2016
Jul. 31, 2014
Oct. 09, 2013
Dec. 31, 2011
Loss Contingencies [Line Items]              
Amount of withdrawal liability       $ 32.9 $ 39.6   $ 32.6
Payment of withdrawal liability assessment amount   $ 19.1          
Acquired Company [Member]              
Loss Contingencies [Line Items]              
Amount of withdrawal liability       $ 4.8   $ 4.8  
Payment of withdrawal liability assessment amount     $ 3.7        
Multiemployer plan withdrawal obligation, amount suggested by Plan which is different than amount recorded by company $ 6.9            
Minimum [Member]              
Loss Contingencies [Line Items]              
Amount of withdrawal liability   40.1 40.1        
Maximum [Member]              
Loss Contingencies [Line Items]              
Amount of withdrawal liability   $ 55.4 $ 55.4