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Intangible Assets and Debt Issuance Costs (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Acquired Intangible Assets by Major Class [Line Items]    
Amortized Intangible Assets, Gross Carrying Amount $ 173,762 $ 173,762
Amortized Intangible Assets, Accumulated Amortization (109,718) (106,708)
Amortized Intangible Assets, Net Amount 64,044 67,054 [1]
Unamortized Intangible Assets (Trademarks), Weighted Useful Lives 0  
Trademarks, net 2,308 2,308 [1]
Intangible assets, gross carrying amount 180,294 180,294
Intangible assets, accumulated amortization (112,961) (109,317)
Intangible assets, net amount 67,333 70,977
Licenses
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 4 years 11 months 16 days  
Amortized Intangible Assets, Gross Carrying Amount 91,488 91,488
Amortized Intangible Assets, Accumulated Amortization (79,240) (77,844)
Amortized Intangible Assets, Net Amount 12,248 13,644
Product lines
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 5 years 10 months 2 days  
Amortized Intangible Assets, Gross Carrying Amount 66,594 66,594
Amortized Intangible Assets, Accumulated Amortization (20,314) (19,561)
Amortized Intangible Assets, Net Amount 46,280 47,033
Customer relationships
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 5 years 2 months 16 days  
Amortized Intangible Assets, Gross Carrying Amount 9,347 9,347
Amortized Intangible Assets, Accumulated Amortization (6,444) (5,903)
Amortized Intangible Assets, Net Amount 2,903 3,444
Trade Name
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 5 years  
Amortized Intangible Assets, Gross Carrying Amount 3,000 3,000
Amortized Intangible Assets, Accumulated Amortization (550) (250)
Amortized Intangible Assets, Net Amount 2,450 2,750
Non-compete/Employment contracts
    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 3 years 10 months 24 days  
Amortized Intangible Assets, Gross Carrying Amount 3,333 3,333
Amortized Intangible Assets, Accumulated Amortization (3,170) (3,150)
Amortized Intangible Assets, Net Amount 163 183
4.50% Convertible senior notes
    
Acquired Intangible Assets by Major Class [Line Items]    
Deferred Costs, Gross Carrying Amount 4,224 4,224
Deferred Costs, Weighted Useful Lives (Years) 2 years 9 months 15 days  
Deferred Costs, Accumulated Amortization (3,243) (2,609)
Deferred Costs, Net Amount $ 981 $ 1,615
[1] Derived from audited financial statements