Goodwill and Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Gross carrying amount:
Gross carrying amount, Beginning balance	$ 45,522	$ 41,428
Associate migration		98
FX adjustments and other	426	(45)
Gross carrying amount, Ending balance	46,119	45,522	41,428
Accumulated amortization:
Amortization expense	(5,394)	(4,606)	(4,000)
FX adjustments and other	(210)	63
Accumulated amortization on intangible assets	27,720	22,116	17,573
Net carrying amount:
Balance, December 31, 2011	23,406
Balance, December 31, 2012	18,399	23,406
BSI [Member]
Gross carrying amount:
Acquisition of Intangible Asset		4,041
CRC Management Consultants LLP [Member]
Gross carrying amount:
Acquisition of Intangible Asset	128
QFS Limited [Member]
Gross carrying amount:
Acquisition of Intangible Asset	43
Customer Relationships [Member]
Gross carrying amount:
Gross carrying amount, Beginning balance	39,306	36,505
FX adjustments and other	359	(35)
Gross carrying amount, Ending balance	39,665	39,306
Accumulated amortization:
Amortization expense	(3,692)	(3,236)
FX adjustments and other	(170)	52
Accumulated amortization on intangible assets	(23,655)	(19,793)	16,609
Net carrying amount:
Balance, December 31, 2011	19,513
Balance, December 31, 2012	16,010	19,513
Customer Relationships [Member] | Maximum [Member]
Net carrying amount:
Estimated useful life (years)	20 years
Customer Relationships [Member] | Minimum [Member]
Net carrying amount:
Estimated useful life (years)	6 years
Customer Relationships [Member] | BSI [Member]
Gross carrying amount:
Acquisition of Intangible Asset		2,836
Trademarks [Member]
Gross carrying amount:
Gross carrying amount, Beginning balance	1,058	505
FX adjustments and other	23	(2)
Gross carrying amount, Ending balance	1,081	1,058
Accumulated amortization:
Amortization expense	(238)	(104)
FX adjustments and other	(11)	3
Accumulated amortization on intangible assets	473	(224)	123
Net carrying amount:
Balance, December 31, 2011	834
Balance, December 31, 2012	608	834
Estimated useful life (years)	6 years
Trademarks [Member] | BSI [Member]
Gross carrying amount:
Acquisition of Intangible Asset		555
Non-compete Agreements [Member]
Gross carrying amount:
Gross carrying amount, Beginning balance	2,293	1,553
Associate migration		98
FX adjustments and other	44	(8)
Gross carrying amount, Ending balance	2,508	2,293
Accumulated amortization:
Amortization expense	(751)	(519)
FX adjustments and other	(29)	8
Accumulated amortization on intangible assets	1,565	(785)	274
Net carrying amount:
Balance, December 31, 2011	1,508
Balance, December 31, 2012	943	1,508
Non-compete Agreements [Member] | Maximum [Member]
Net carrying amount:
Estimated useful life (years)	5 years
Non-compete Agreements [Member] | Minimum [Member]
Net carrying amount:
Estimated useful life (years)	1 year
Non-compete Agreements [Member] | BSI [Member]
Gross carrying amount:
Acquisition of Intangible Asset		650
Non-compete Agreements [Member] | CRC Management Consultants LLP [Member]
Gross carrying amount:
Acquisition of Intangible Asset	128
Non-compete Agreements [Member] | QFS Limited [Member]
Gross carrying amount:
Acquisition of Intangible Asset	43
Trade Names [Member]
Gross carrying amount:
Gross carrying amount, Beginning balance	2,865	2,865
Gross carrying amount, Ending balance	2,865	2,865
Accumulated amortization:
Amortization expense	(713)	(747)
FX adjustments and other
Accumulated amortization on intangible assets	2,027	(1,314)	567
Net carrying amount:
Balance, December 31, 2011	1,551
Balance, December 31, 2012	$ 838	$ 1,551
Trade Names [Member] | Maximum [Member]
Net carrying amount:
Estimated useful life (years)	5 years
Trade Names [Member] | Minimum [Member]
Net carrying amount:
Estimated useful life (years)	4 years