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Changes in Stockholders' Equity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Stockholders Equity Note [Line Items]    
Beginning Balance $ 112,851  
Issuance of common stock pursuant to ARIAD stock plans 1,522  
Issuance of common stock, net of issuance costs 310,037  
Stock-based compensation 5,610  
Payment of tax withholding obligations related to stock- based compensation (1,392)  
Net unrealized losses on marketable securities (5)  
Cumulative translation adjustment 23  
Net loss (64,670) (55,894)
Ending Balance 363,976  
Common stock
   
Stockholders Equity Note [Line Items]    
Beginning Balance (in shares) 167,075,758  
Beginning Balance 167  
Issuance of common stock pursuant to ARIAD stock plans (in shares) 986,523  
Issuance of common stock pursuant to ARIAD stock plans 1  
Issuance of common stock, net of issuance costs (in shares) 16,489,893  
Issuance of common stock, net of issuance costs 17  
Ending Balance (in shares) 184,552,174  
Ending Balance 185  
Additional Paid-in Capital
   
Stockholders Equity Note [Line Items]    
Beginning Balance 890,499  
Issuance of common stock pursuant to ARIAD stock plans 1,521  
Issuance of common stock, net of issuance costs 310,020  
Stock-based compensation 5,610  
Payment of tax withholding obligations related to stock- based compensation (1,392)  
Ending Balance 1,206,258  
Accumulated Other Comprehensive Income (Loss)
   
Stockholders Equity Note [Line Items]    
Beginning Balance 20  
Net unrealized losses on marketable securities (5)  
Cumulative translation adjustment 23  
Ending Balance 38  
Accumulated Deficit
   
Stockholders Equity Note [Line Items]    
Beginning Balance (777,835)  
Net loss (64,670)  
Ending Balance $ (842,505)