Segment Reporting - Financial Information of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Revenue      
External customers $ 134,408 $ 107,586  
Income (loss) from operations (15,132) (7,205)  
Goodwill 159,342   159,342
Total assets 589,535   563,316
Consumer      
Revenue      
External customers 128,201 100,995  
Intersegment revenue 0 0  
Income (loss) from operations (10,755) (3,268)  
Goodwill 99,805   99,805
Total assets 485,016   455,035
Enterprise      
Revenue      
External customers 6,207 6,591  
Intersegment revenue 2,056 1,514  
Income (loss) from operations (4,377) (3,937)  
Goodwill 59,537   59,537
Total assets 105,219   108,905
Eliminations      
Revenue      
Intersegment revenue (2,056) (1,514)  
Total assets $ (700)   $ (624)