Goodwill by Reportable Segment (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Goodwill [Line Items]
Goodwill beginning balance	$ 9,866	$ 10,032
Accumulated impairment losses, beginning balance	(1,697)
Goodwill beginning balance	8,169	10,032
Goodwill written off		(1,697)
Effect of net foreign currency exchange rate changes	235	(166)
Goodwill ending balance	24,395	9,866
Accumulated impairment losses, ending balance	(1,697)	(1,697)
Goodwill ending balance	22,698	8,169
Thoughtcorp Inc
Goodwill [Line Items]
Acquisition of Goodwill	2,935
Empathy Lab LLC
Goodwill [Line Items]
Acquisition of Goodwill	11,359
North America
Goodwill [Line Items]
Goodwill beginning balance	2,286	2,286
Accumulated impairment losses, beginning balance
Goodwill beginning balance	2,286	2,286
Goodwill written off
Effect of net foreign currency exchange rate changes	63
Goodwill ending balance	16,643	2,286
Accumulated impairment losses, ending balance
Goodwill ending balance	16,643	2,286
North America | Thoughtcorp Inc
Goodwill [Line Items]
Acquisition of Goodwill	2,935
North America | Empathy Lab LLC
Goodwill [Line Items]
Acquisition of Goodwill	11,359
EU
Goodwill [Line Items]
Goodwill beginning balance	2,864	2,864
Accumulated impairment losses, beginning balance
Goodwill beginning balance	2,864	2,864
Goodwill written off
Effect of net foreign currency exchange rate changes
Goodwill ending balance	2,864	2,864
Accumulated impairment losses, ending balance
Goodwill ending balance	2,864	2,864
EU | Thoughtcorp Inc
Goodwill [Line Items]
Acquisition of Goodwill
EU | Empathy Lab LLC
Goodwill [Line Items]
Acquisition of Goodwill
Russia
Goodwill [Line Items]
Goodwill beginning balance	3,019	3,185
Accumulated impairment losses, beginning balance
Goodwill beginning balance	3,019	3,185
Goodwill written off
Effect of net foreign currency exchange rate changes	172	(166)
Goodwill ending balance	3,191	3,019
Accumulated impairment losses, ending balance
Goodwill ending balance	3,191	3,019
Russia | Thoughtcorp Inc
Goodwill [Line Items]
Acquisition of Goodwill
Russia | Empathy Lab LLC
Goodwill [Line Items]
Acquisition of Goodwill
Other Segment
Goodwill [Line Items]
Goodwill beginning balance	1,697	1,697
Accumulated impairment losses, beginning balance	(1,697)
Goodwill beginning balance		1,697
Goodwill written off		(1,697)
Effect of net foreign currency exchange rate changes
Goodwill ending balance	1,697	1,697
Accumulated impairment losses, ending balance	(1,697)	(1,697)
Goodwill ending balance
Other Segment | Thoughtcorp Inc
Goodwill [Line Items]
Acquisition of Goodwill
Other Segment | Empathy Lab LLC
Goodwill [Line Items]
Acquisition of Goodwill