Quarterly report pursuant to Section 13 or 15(d)

Segment Information - Additional Information (Detail)

v3.10.0.1
Segment Information - Additional Information (Detail)
6 Months Ended
Jun. 30, 2018
Segment
service_center
primary_market
Segment Reporting Information [Line Items]  
Number of reportable segments | Segment 3
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