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Segment information - Schedule of Information Regarding Services and Performance Marketing Segments (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Revenue:          
Revenue $ 41,043 $ 994 $ 80,467 $ 2,252  
Loss from operations:          
Operating loss (7,856) (3,716) (16,028) (5,279)  
Depreciation and amortization:          
Depreciation and amortization 2,996 41 5,605 76  
Capital expenditure:          
Capital expenditure 3,265 1,712 6,479 1,855  
Assets:          
Assets 312,088   312,088   $ 289,192
Intangible assets, net:          
Intangible assets, net 104,361   104,361   87,445
Goodwill:          
Goodwill 166,083   166,083   161,753
Information Services [Member]          
Revenue:          
Revenue 13,400 994 24,451 2,252  
Loss from operations:          
Operating loss (6,332) (3,716) (13,120) (5,279)  
Depreciation and amortization:          
Depreciation and amortization 1,405 41 2,556 76  
Capital expenditure:          
Capital expenditure 2,939 $ 1,712 5,934 $ 1,855  
Assets:          
Assets 116,945   116,945   102,582
Intangible assets, net:          
Intangible assets, net 55,776   55,776   42,951
Goodwill:          
Goodwill 44,121   44,121   42,623
Performance Marketing [Member]          
Revenue:          
Revenue 27,643   56,016    
Loss from operations:          
Operating loss (1,524)   (2,908)    
Depreciation and amortization:          
Depreciation and amortization 1,591   3,049    
Capital expenditure:          
Capital expenditure 326   545    
Assets:          
Assets 195,143   195,143   186,610
Intangible assets, net:          
Intangible assets, net 48,585   48,585   44,494
Goodwill:          
Goodwill $ 121,962   $ 121,962   $ 119,130