GUARANTOR SUBSIDIARIES - Schedule of Condensed Consolidating Statement of Operations and Comprehensive Income (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Condensed Financial Statements, Captions [Line Items]    
Net sales $ 198,492 $ 174,545
Costs and expenses:    
Cost of sales 156,471 146,076
Selling, general, and administrative expenses 23,658 25,868
Merger-related expenses 4,734 0
Research, technical, and product development expenses 1,465 984
Operating income 12,164 1,617
Other (expense) income, net (856) 535
Interest expense, net (7,884) (7,557)
Equity in earnings of subsidiaries 0 0
Income (loss) before income taxes 3,424 (5,405)
Provision for (benefit from) income taxes (1,109) (1,589)
Net income (loss) attributable to continuing operations 4,533 (3,816)
Net loss attributable to discontinued operations, net of tax 0 (365)
Net income (loss) 4,533 (4,181)
Comprehensive income (4,091) (7,195)
RTI International Metals, Inc.    
Condensed Financial Statements, Captions [Line Items]    
Net sales 0 0
Costs and expenses:    
Cost of sales 0 0
Selling, general, and administrative expenses (312) 947
Merger-related expenses 4,734  
Research, technical, and product development expenses 0 0
Operating income (4,422) (947)
Other (expense) income, net (2) 1,490
Interest expense, net (7,940) (5,815)
Equity in earnings of subsidiaries 11,036 1,458
Income (loss) before income taxes (1,328) (3,814)
Provision for (benefit from) income taxes (5,861) 2
Net income (loss) attributable to continuing operations 4,533 (3,816)
Net loss attributable to discontinued operations, net of tax   (365)
Net income (loss)   (4,181)
Comprehensive income (4,091) (7,195)
Guarantor Subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Net sales 123,972 114,123
Costs and expenses:    
Cost of sales 104,146 102,120
Selling, general, and administrative expenses 11,869 12,158
Merger-related expenses 0  
Research, technical, and product development expenses 1,465 984
Operating income 6,492 (1,139)
Other (expense) income, net 38 (838)
Interest expense, net 1,014 (1,202)
Equity in earnings of subsidiaries 720 348
Income (loss) before income taxes 8,264 (2,831)
Provision for (benefit from) income taxes 2,538 (1,530)
Net income (loss) attributable to continuing operations 5,726 (1,301)
Net loss attributable to discontinued operations, net of tax   0
Net income (loss)   (1,301)
Comprehensive income 6,614 (346)
Non-Guarantor Subsidiaries    
Condensed Financial Statements, Captions [Line Items]    
Net sales 131,417 114,289
Costs and expenses:    
Cost of sales 109,222 97,823
Selling, general, and administrative expenses 12,101 12,763
Merger-related expenses 0  
Research, technical, and product development expenses 0 0
Operating income 10,094 3,703
Other (expense) income, net (892) (117)
Interest expense, net (958) (540)
Equity in earnings of subsidiaries 44 975
Income (loss) before income taxes 8,288 4,021
Provision for (benefit from) income taxes 2,214 (61)
Net income (loss) attributable to continuing operations 6,074 4,082
Net loss attributable to discontinued operations, net of tax   (365)
Net income (loss)   3,717
Comprehensive income (3,546) (376)
Eliminations    
Condensed Financial Statements, Captions [Line Items]    
Net sales (56,897) (53,867)
Costs and expenses:    
Cost of sales (56,897) (53,867)
Selling, general, and administrative expenses 0 0
Merger-related expenses 0  
Research, technical, and product development expenses 0 0
Operating income 0 0
Other (expense) income, net 0 0
Interest expense, net 0 0
Equity in earnings of subsidiaries (11,800) (2,781)
Income (loss) before income taxes (11,800) (2,781)
Provision for (benefit from) income taxes 0 0
Net income (loss) attributable to continuing operations (11,800) (2,781)
Net loss attributable to discontinued operations, net of tax   365
Net income (loss)   (2,416)
Comprehensive income $ (3,068) $ 722