Changes in Carrying Amount of Goodwill (Detail) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011
Goodwill [Line Items]
Gross Balance prior to the end of year	$ 251,367
Total impairment prior to the end of year	(47,432)
Beginning Balance	203,935
Addition - acquisition of ISD	11,380	[1]
Foreign currency translation adjustments	4,000
Ending Balance	219,315
Americas
Goodwill [Line Items]
Gross Balance prior to the end of year	187,362
Total impairment prior to the end of year	(47,432)
Beginning Balance	139,930
Addition - acquisition of ISD	11,380	[1]
Foreign currency translation adjustments	109
Ending Balance	151,419
EMEA
Goodwill [Line Items]
Gross Balance prior to the end of year	44,250
Beginning Balance	44,250
Foreign currency translation adjustments	3,120
Ending Balance	47,370
Asia /Pacific
Goodwill [Line Items]
Gross Balance prior to the end of year	19,755
Beginning Balance	19,755
Foreign currency translation adjustments	771
Ending Balance	$ 20,526

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