Segment Information (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information      
Revenue $ 182,644 $ 152,550 $ 132,794
Operating expenses 177,682 153,575 140,496
Gain on sales of intangible assets   3,774 6,296
Income (loss) from operations 4,962 2,749 (17,243)
Less reconciling items:      
Stock based compensation 11,903 9,264 15,696
Impairment of goodwill     15,837
Amortization of intangible assets from acquisitions 434 [1] 2,926 [1] 4,728 [1]
Acquisition and separation related costs (68) 878 753
Income (loss) before provision for income taxes 4,900 2,712 (17,692)
Call Driven      
Segment Reporting Information      
Revenue 168,051 135,126 111,886
Archeo      
Segment Reporting Information      
Revenue 14,593 17,424 20,908
Operating Segments      
Segment Reporting Information      
Revenue 182,644 152,550 132,794
Operating expenses 165,413 140,534 119,377
Gain on sales of intangible assets   3,774 6,296
Income (loss) from operations 17,231 15,790 19,713
Less reconciling items:      
Stock based compensation 11,903 9,237 15,638
Impairment of goodwill     15,837
Amortization of intangible assets from acquisitions 434 2,926 4,728
Acquisition and separation related costs (68) 878 753
Interest expense and other, net 62 37 449
Income (loss) before provision for income taxes 4,900 2,712 (17,692)
Operating Segments | Call Driven      
Segment Reporting Information      
Revenue 168,051 135,126 111,886
Operating expenses 156,952 128,829 106,795
Income (loss) from operations 11,099 6,297 5,091
Operating Segments | Archeo      
Segment Reporting Information      
Revenue 14,593 17,424 20,908
Operating expenses 8,461 11,705 12,582
Gain on sales of intangible assets   3,774 6,296
Income (loss) from operations $ 6,132 $ 9,493 $ 14,622
[1] Components of amortization of intangible assets from acquisitions: