Quarterly report pursuant to Section 13 or 15(d)

Business and Credit Concentrations - Additional Information (Detail)

v3.8.0.1
Business and Credit Concentrations - Additional Information (Detail)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Customer
Sep. 30, 2016
USD ($)
Customer
Sep. 30, 2017
USD ($)
Customer
Sep. 30, 2016
USD ($)
Customer
Dec. 31, 2016
USD ($)
Customer
Concentration Risk [Line Items]          
Credit losses attributable to write-offs | $ $ 5.7 $ 1.3 $ 7.9 $ 5.2  
Net Sales [Member] | Customer Concentration Risk [Member]          
Concentration Risk [Line Items]          
Number of largest customers | Customer 5 5 5 5  
Percentage of concentration risk 11.40% 10.30% 12.50% 11.70%  
Number of customers accounting for more than 10% | Customer 0 0 0 0  
Net Trade Receivable [Member] | Credit Concentration Risk [Member]          
Concentration Risk [Line Items]          
Number of customers accounting for more than 10% | Customer     0   0
Net Trade Receivable [Member] | One Customer [Member] | Credit Concentration Risk [Member]          
Concentration Risk [Line Items]          
Percentage of concentration risk         10.60%
Number of customers accounting for more than 10% | Customer         1
Domestic [Member]          
Concentration Risk [Line Items]          
Accounts receivable | $ $ 220.1   $ 220.1   $ 169.4
Non-US [Member]          
Concentration Risk [Line Items]          
Accounts receivable | $ 313.7   313.7   199.1
Net total assets held outside the United States | $ $ 1,360.0   $ 1,360.0   $ 1,060.0