SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Net sales $ 198,492 $ 174,545
Operating income 12,164 1,617
Merger-related expenses (4,734) 0
Other (expense) income, net (856) 535
Interest expense, Net (7,884) (7,557)
Income (loss) before income taxes 3,424 (5,405)
Titanium Segment    
Segment Reporting Information [Line Items]    
Net sales 107,358 102,026
Operating income 9,690 5,902
Engineered Products and Services Segment    
Segment Reporting Information [Line Items]    
Net sales 134,639 125,531
Operating income 7,208 (4,285)
Operating Segments | Titanium Segment    
Segment Reporting Information [Line Items]    
Net sales 83,500 76,980
Operating income 14,388 10,429
Operating Segments | Engineered Products and Services Segment    
Segment Reporting Information [Line Items]    
Net sales 114,992 97,565
Operating income 12,911 1,811
Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Net sales 43,505 53,012
Intersegment Eliminations | Titanium Segment    
Segment Reporting Information [Line Items]    
Net sales 23,858 25,046
Intersegment Eliminations | Engineered Products and Services Segment    
Segment Reporting Information [Line Items]    
Net sales 19,647 27,966
Corporate, Non-Segment | Titanium Segment    
Segment Reporting Information [Line Items]    
Operating income (4,698) (4,527)
Corporate, Non-Segment | Engineered Products and Services Segment    
Segment Reporting Information [Line Items]    
Operating income $ (5,703) $ (6,096)