Segment Information - Additional Information (Detail) - 6 months ended Jun. 30, 2015	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	6