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Intangible Assets and Debt Issuance Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Acquired Intangible Assets by Major Class [Line Items]    
Amortized Intangible Assets Amount, Gross Carrying Amount $ 121,217 $ 121,217
Amortized Intangible Assets Amount, Accumulated Amortization (101,475) (99,464)
Amortized Intangible Assets Amount, Net Amount 19,742 21,753 [1]
Unamortized Intangible Assets (Trademarks), Weighted Useful Lives indefinite  
Trademarks, net 2,308 2,308 [1]
Intangible assets, gross carrying amount 127,203 127,203
Intangible assets, accumulated Amortization (103,436) (101,056)
Intangible assets, net Amount 23,767 26,147
Licenses
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 4 years 350 days  
Amortized Intangible Assets Amount, Gross Carrying Amount 91,488 91,488
Amortized Intangible Assets Amount, Accumulated Amortization (74,348) (72,797)
Amortized Intangible Assets Amount, Net Amount 17,140 18,691
Product lines
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 3 years 237 days  
Amortized Intangible Assets Amount, Gross Carrying Amount 19,500 19,500
Amortized Intangible Assets Amount, Accumulated Amortization (18,863) (18,787)
Amortized Intangible Assets Amount, Net Amount 637 713
Customer relationships
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 5 years 102 days  
Amortized Intangible Assets Amount, Gross Carrying Amount 7,096 7,096
Amortized Intangible Assets Amount, Accumulated Amortization (5,131) (4,800)
Amortized Intangible Assets Amount, Net Amount 1,965 2,296
Non-compete/Employment contracts
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 3 years 307 days  
Amortized Intangible Assets Amount, Gross Carrying Amount 3,133 3,133
Amortized Intangible Assets Amount, Accumulated Amortization (3,133) (3,080)
Amortized Intangible Assets Amount, Net Amount   53
Debt issuance costs
    
Acquired Intangible Assets by Major Class [Line Items]    
Deferred Costs, Gross Carrying Amount 3,678 3,678
Deferred Costs, Weighted Useful Lives (Years) 5 years  
Deferred Costs, Accumulated Amortization (1,961) (1,592)
Deferred Costs, Net Amount $ 1,717 $ 2,086
[1] Derived from audited financial statements