Goodwill and Other Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cost [Abstract]
Beginning balance							$ 256,842	$ 248,911
Acquisitions								673
Additional purchase accounting adjustments							(1,436)	5,239
Goodwill allocated to business sold							(7,000)
Foreign currency translation							(1,482)	2,019
Ending balance	246,924						246,924	256,842	248,911
Accumulated impairment [Abstract]
Beginning balance							(44,939)	(43,546)
Foreign currency translation							(72)	(1,393)
Ending balance	(45,011)						(45,011)	(44,939)	(43,546)
Net book value [Abstract]
Balance at end of period	201,913						201,913	211,903	205,365
Other intangible assets subject to amortization [Abstract]
Weighted Average Life							13 years 1 month 6 days	13 years
Cost	60,020						60,020	62,071
Accumulated Amortization	(35,524)						(35,524)	(32,657)
Net	24,496						24,496	29,414
Period over which acquired companies have had key relationships with fortune 500 companies, minimum							15 years
Impairments related to long-lived assets	0	[1]	0	466	4,281	0	502	4,356	40
Amortization of intangible assets for continuing operations							4,089	5,170	5,127
Expected future amortization expense for next five years [Abstract]
2014	3,933						3,933
2015	3,746						3,746
2016	3,696						3,696
2017	3,508						3,508
2018	3,434						3,434
Customer relationships [Member]
Other intangible assets subject to amortization [Abstract]
Weighted Average Life							13 years 10 months 24 days	13 years 8 months 12 days
Cost	55,377						55,377	57,343
Accumulated Amortization	(31,342)						(31,342)	(28,562)
Net	24,035						24,035	28,781
Digital images [Member]
Other intangible assets subject to amortization [Abstract]
Weighted Average Life							5 years	5 years
Cost	450						450	450
Accumulated Amortization	(450)						(450)	(450)
Net	0						0	0
Developed technologies [Member]
Other intangible assets subject to amortization [Abstract]
Weighted Average Life							3 years	3 years
Cost	712						712	712
Accumulated Amortization	(712)						(712)	(712)
Net	0						0	0
Non-compete agreements [Member]
Other intangible assets subject to amortization [Abstract]
Weighted Average Life							3 years 7 months 6 days	3 years 7 months 6 days
Cost	827						827	877
Accumulated Amortization	(790)						(790)	(821)
Net	37						37	56
Trade names [Member]
Other intangible assets subject to amortization [Abstract]
Weighted Average Life							3 years 10 months 24 days	3 years 10 months 24 days
Cost	1,434						1,434	1,469
Accumulated Amortization	(1,010)						(1,010)	(892)
Net	424						424	577
Contract acquisition cost [Member]
Other intangible assets subject to amortization [Abstract]
Weighted Average Life							3 years	3 years
Cost	1,220						1,220	1,220
Accumulated Amortization	(1,220)						(1,220)	(1,220)
Net	0						0	0
Americas [Member]
Cost [Abstract]
Beginning balance							203,987	198,510
Acquisitions								673
Additional purchase accounting adjustments							0	4,301
Goodwill allocated to business sold							(7,000)
Foreign currency translation							(1,512)	503
Ending balance	195,475						195,475	203,987
Accumulated impairment [Abstract]
Beginning balance							(14,540)	(14,422)
Foreign currency translation							355	(118)
Ending balance	(14,185)						(14,185)	(14,540)
Net book value [Abstract]
Balance at end of period	181,290						181,290	189,447	184,088
Americas [Member] | Customer relationships [Member]
Other intangible assets subject to amortization [Abstract]
Impairment of intangible assets							466	2,350
Europe [Member]
Cost [Abstract]
Beginning balance							43,025	40,364
Acquisitions								0
Additional purchase accounting adjustments							(1,436)	1,368
Goodwill allocated to business sold							0
Foreign currency translation							1,096	1,293
Ending balance	42,685						42,685	43,025
Accumulated impairment [Abstract]
Beginning balance							(29,129)	(27,878)
Foreign currency translation							(610)	(1,251)
Ending balance	(29,739)						(29,739)	(29,129)
Net book value [Abstract]
Balance at end of period	12,946						12,946	13,896	12,486
Europe [Member] | Customer relationships [Member]
Other intangible assets subject to amortization [Abstract]
Impairment of intangible assets								1,413
Asia Pacific [Member]
Cost [Abstract]
Beginning balance							9,830	10,037
Acquisitions								0
Additional purchase accounting adjustments							0	(430)
Goodwill allocated to business sold							0
Foreign currency translation							(1,066)	223
Ending balance	8,764						8,764	9,830
Accumulated impairment [Abstract]
Beginning balance							(1,270)	(1,246)
Foreign currency translation							183	(24)
Ending balance	(1,087)						(1,087)	(1,270)
Net book value [Abstract]
Balance at end of period	7,677						7,677	8,560	8,791
Asia Pacific [Member] | Customer Relationships and Trade Name [Member]
Other intangible assets subject to amortization [Abstract]
Impairment of intangible assets							$ 36

[1] Results for the fourth quarter of 2013 were favorably impacted by a credit to income of approximately $518 for the reversal of a liability recorded in purchase accounting for a recent acquisition that is no longer needed due to statute expiration in the current quarter, and a credit to income of approximately $425 for net reserve reductions at certain of the Company’s vacant leased properties, for which a change in circumstances in the current quarter required a revision in the estimate of future expenses related to the leases. In addition, results for the current quarter were favorably impacted by a credit to income of approximately $736 for the correction of an error in the valuation of unbilled services that was immaterial to all prior periods presented.