Annual report pursuant to Section 13 and 15(d)

Segment Information - Additional Information (Detail)

v3.10.0.1
Segment Information - Additional Information (Detail)
12 Months Ended
Dec. 31, 2018
Segment
Customer
service_center
primary_market
Dec. 31, 2017
Customer
Dec. 31, 2016
Customer
Segment Reporting Information [Line Items]      
Number of reportable segments | Segment 3    
Sales Revenue, Net [Member] | Customer Concentration Risk [Member]      
Segment Reporting Information [Line Items]      
Number of customers | Customer 0 0 0
Olin Brass [Member]      
Segment Reporting Information [Line Items]      
Number of primary markets 5    
Chase Brass [Member]      
Segment Reporting Information [Line Items]      
Number of primary markets 4    
A.J. Oster [Member]      
Segment Reporting Information [Line Items]      
Number of primary markets 3    
A.J. Oster [Member] | United States, Puerto Rico, and Mexico [Member]      
Segment Reporting Information [Line Items]      
Number of strategically-located service centers | service_center 11