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Intangible Assets and Debt Issuance Costs (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Acquired Intangible Assets by Major Class [Line Items]    
Intangible assets, gross carrying amount $ 190,994 $ 188,704
Intangible assets, accumulated amortization (131,277) (137,560)
Intangible assets, net amount 59,717 51,144
Trademarks, net 2,308 2,308
Amortized Intangible Assets, Gross Carrying Amount 173,763 174,963
Amortized Intangible Assets, Accumulated Amortization (124,859) (132,778)
Amortized Intangible Assets, Net Amount $ 48,904 42,185
4.50% Convertible senior notes    
Acquired Intangible Assets by Major Class [Line Items]    
Deferred Costs, Weighted Useful Lives (Years) 3 years 9 months 7 days  
Deferred Costs, Gross Carrying Amount $ 14,923 11,433
Deferred Costs, Accumulated Amortization (6,418) (4,782)
Deferred Costs, Net Amount $ 8,505 6,651
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 (85,113) (86,994)
Amortized Intangible Assets, Net Amount $ 6,375 4,494
Product Lines    
Acquired Intangible Assets by Major Class [Line Items]    
Weighted Useful Lives (Years) 5 years 8 months 27 days  
Amortized Intangible Assets, Gross Carrying Amount $ 66,594 67,794
Amortized Intangible Assets, Accumulated Amortization (27,235) (32,077)
Amortized Intangible Assets, Net Amount $ 39,359 35,717
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 (7,831) (8,391)
Amortized Intangible Assets, Net Amount $ 1,517 957
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 (1,450) (2,050)
Amortized Intangible Assets, Net Amount $ 1,550 950
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 (3,230) (3,266)
Amortized Intangible Assets, Net Amount $ 103 $ 67