ACQUISITIONS - Purchase Price Allocation (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Jan. 22, 2014
Jun. 03, 2014
Business Acquisition [Line Items]        
Goodwill $ 144,513 $ 145,518    
RTI Directed Manufacturing        
Business Acquisition [Line Items]        
Current assets, excluding inventory     717  
Inventories     452  
Plant and equipment     1,973  
Goodwill     14,712  
Current liabilities     (285)  
Net assets acquired     22,469  
RTI Directed Manufacturing | Customer Relationships        
Business Acquisition [Line Items]        
Intangible assets     2,800  
RTI Directed Manufacturing | Directed Manufacturing trade name        
Business Acquisition [Line Items]        
Intangible assets     1,000  
RTI Directed Manufacturing | Developed technologies        
Business Acquisition [Line Items]        
Intangible assets     1,100  
RTI Advanced Powder Materials        
Business Acquisition [Line Items]        
Current assets, excluding inventory       324
Inventories       174
Plant and equipment       101
Goodwill       14,211
Current liabilities       (271)
Deferred tax liabilities       (1,572)
Contingent consideration       (1,600)
Net assets acquired       15,567
RTI Advanced Powder Materials | Customer Relationships        
Business Acquisition [Line Items]        
Intangible assets       3,250
RTI Advanced Powder Materials | Developed technologies        
Business Acquisition [Line Items]        
Intangible assets       850
RTI Advanced Powder Materials | Backlog        
Business Acquisition [Line Items]        
Intangible assets       $ 100