Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands	9 Months Ended
	Sep. 30, 2011
Goodwill [Line Items]
Gross Balance prior to the beginning of the year	$ 251,367
Total impairment prior to the beginning of the year	(47,432)
Beginning Balance	203,935
Addition-acquisition of ISD	11,380	[1]
Foreign currency translation adjustments	549
Ending Balance	215,864
Americas
Goodwill [Line Items]
Gross Balance prior to the beginning of the year	187,362
Total impairment prior to the beginning of the year	(47,432)
Beginning Balance	139,930
Addition-acquisition of ISD	11,380	[1]
Foreign currency translation adjustments	(144)
Ending Balance	151,166
EMEA
Goodwill [Line Items]
Gross Balance prior to the beginning of the year	44,250
Beginning Balance	44,250
Foreign currency translation adjustments	938
Ending Balance	45,188
Asia /Pacific
Goodwill [Line Items]
Gross Balance prior to the beginning of the year	19,755
Beginning Balance	19,755
Foreign currency translation adjustments	(245)
Ending Balance	$ 19,510

[1] Addition relates to the goodwill acquired in the acquisition of ISD as discussed in Note 2.