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Intangible Assets and Debt Issuance Costs (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Acquired Intangible Assets by Major Class [Line Items]    
Intangible assets, gross carrying amount $ 192,381 $ 190,994
Intangible assets, accumulated amortization (138,848) (131,277)
Intangible assets, net amount 53,533 59,717
Trademarks, net 2,308 2,308 [1]
Amortized Intangible Assets, Gross Carrying Amount 174,963 173,763
Amortized Intangible Assets, Accumulated Amortization (130,966) (124,859)
Amortized Intangible Assets, Net Amount $ 43,997 48,904 [1]
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 (86,816) (85,113)
Amortized Intangible Assets, Net Amount $ 4,672 6,375
Product Lines    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 5 years 9 months 26 days  
Amortized Intangible Assets, Gross Carrying Amount $ 67,794 66,594
Amortized Intangible Assets, Accumulated Amortization (30,799) (27,235)
Amortized Intangible Assets, Net Amount $ 36,995 39,359
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 $ 9,348 9,348
Amortized Intangible Assets, Accumulated Amortization (8,246) (7,831)
Amortized Intangible Assets, Net Amount $ 1,102 1,517
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 (1,849) (1,450)
Amortized Intangible Assets, Net Amount $ 1,151 1,550
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 (3,256) (3,230)
Amortized Intangible Assets, Net Amount $ 77 103
4.50% Convertible senior notes    
Acquired Intangible Assets by Major Class [Line Items]    
Deferred Costs, Weighted Useful Lives (Years) 4 years  
Deferred Costs, Gross Carrying Amount $ 15,110 14,923
Deferred Costs, Accumulated Amortization (7,882) (6,418)
Deferred Costs, Net Amount $ 7,228 $ 8,505
[1] Derived from audited financial statements