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DEBT (Additional Information) (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Jun. 15, 2011
Debt Instrument [Line Items]      
Carrying amount of liability $ 199,511,000 $ 197,672,000  
Senior Credit Facility
      
Debt Instrument [Line Items]      
Cash balance threshold above which excess amount is not subject to any restriction of use or investment 40,000,000    
Line of credit facility outstanding 321,900,000 321,900,000  
Weighted average interest rate on debt 1.70% 1.80%  
Available borrowings under senior secured revolving credit facility 278,100,000    
Fair value of outstanding borrowings 317,100,000    
Senior Credit Facility | Option (ii), (x)
      
Debt Instrument [Line Items]      
Interest rates available to the Company at its option 0.50%    
Senior Credit Facility | Option (ii), (z)
      
Debt Instrument [Line Items]      
Interest rates available to the Company at its option 1.00%    
Senior Credit Facility | Minimum
      
Debt Instrument [Line Items]      
Line of credit, commitment fee percentage 0.15%    
Senior Credit Facility | Minimum | Option (i)
      
Debt Instrument [Line Items]      
Interest rates available to the Company at its option 1.00%    
Senior Credit Facility | Maximum
      
Debt Instrument [Line Items]      
Line of credit, commitment fee percentage 0.30%    
Senior Credit Facility | Maximum | Option (i)
      
Debt Instrument [Line Items]      
Interest rates available to the Company at its option 1.75%    
Senior Credit Facility | August 2010 Amendment
      
Debt Instrument [Line Items]      
Line of credit facility, expiration date Aug. 10, 2015    
Senior Credit Facility | June 2011 Amendment [Member]
      
Debt Instrument [Line Items]      
Reallocated term loan 150,000,000    
Additional commitments 200,000,000    
Line of credit facility, expiration date Jun. 08, 2016    
Senior Credit Facility | June 2011 Amendment [Member] | Minimum
      
Debt Instrument [Line Items]      
Senior credit facility, maximum borrowing capacity 450,000,000    
Senior Credit Facility | June 2011 Amendment [Member] | Maximum
      
Debt Instrument [Line Items]      
Senior credit facility, maximum borrowing capacity 600,000,000    
Senior Credit Facility | May 2012 Amendment
      
Debt Instrument [Line Items]      
Leverage ratio 3.75    
2016 Convertible Senior Notes
      
Debt Instrument [Line Items]      
Fair value of outstanding borrowings 236,300,000    
Principal amount outstanding 230,000,000 230,000,000 230,000,000
Interest rate on debt     1.625%
Portion of the debt proceeds that was classified as equity at the time of the offering     43,200,000
Effective interest rate implicit in the liability component 5.60%    
Carrying amount of liability 199,500,000 197,700,000  
Unamortized discount 30,500,000 32,300,000  
Common stock based on initial conversion rate ratio (in shares) 17.4092    
Principal amount to be considered for conversion purpose 1,000    
Initial conversion price, per share $ 57.44    
Maximum selling price of company's common stock 150.00%    
Principal amount of notes per average trading price $ 1,000    
Maximum average conversion value of the Notes 98.00%    
Earliest conversion date June 15, 2016    
Strike price of the call transaction (in dollars per share) $ 57.44    
Strike price of warrant transactions (in dollars per share) $ 70.05