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Goodwill and Other Intangible Assets - Components of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Amortized:    
Gross amortized other intangible assets $ 69,925 $ 28,216
Accumulated Amortization (7,615) (4,015)
Net amortized other intangible assets 62,310 24,201
Total other intangible assets, net 102,667 50,892
Non-compete agreements
   
Amortized:    
Total estimated life 5 years  
Gross amortized other intangible assets 540 540
Dealer/customer related
   
Amortized:    
Total estimated life 7 years  
Gross amortized other intangible assets 56,562 14,702
Developed technology
   
Amortized:    
Gross amortized other intangible assets 12,823 12,974
Developed technology | Minimum
   
Amortized:    
Total estimated life 5 years  
Developed technology | Maximum
   
Amortized:    
Total estimated life 7 years  
Brand names
   
Non-amortizable - indefinite lived:    
Non-amortizable, Net $ 40,357 $ 26,691