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STOCKHOLDERS' EQUITY (Details) (USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Compensation cost charged to expense $ 22,088,000 $ 15,578,000 $ 13,034,000
Less: Discontinued operations (1,003,000) (1,310,000) (1,181,000)
Continuing operations 21,085,000 14,268,000 11,853,000
Rowan Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 4,500,000    
Number of shares available for future grant (in shares) 1,812,587    
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Unrecognized compensation cost related to all nonvested share-based compensation arrangements 22,200,000    
Compensation expense over a remaining weighted-average period (in years) 1.8    
Restricted Stock [Member]
     
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Grant vesting term One-third annually or cliff vest at the end of a two or three year service.    
Service period (in years) 3Y    
Restricted Stock - Minority [Member]
     
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Service period, minimum (in years) 2Y    
Service period, maximum (in years) 3Y    
Restricted Stock Units (RSUs) [Member]
     
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Service period (in years) 1Y    
Performance-Based Awards [Member]
     
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Compensation cost charged to expense 124,000 (718,000) 1,467,000
Stock Appreciation Rights (SARs) [Member]
     
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Compensation cost charged to expense 5,813,000 2,678,000 855,000
Grant vesting term one-third annually    
Service period (in years) 3Y    
Stock Options [Member]
     
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Compensation cost charged to expense 239,000 239,000 378,000
Grant vesting term one-third or one-quarter annually    
Service period, minimum (in years) 3Y    
Service period, maximum (in years) 4Y    
Restricted Stock and Units [Member]
     
Compensation cost charged to expense under all stock-based incentive awards [Abstract]      
Compensation cost charged to expense $ 15,912,000 $ 13,379,000 $ 10,334,000