Acquisitions (Summary Of Purchase Price Allocation) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Business Acquisition [Line Items]
Other intangible assets	$ 102,658	$ 168,200
All 2012 Acquisitions [Member]
Business Acquisition [Line Items]
Trade and other receivables	10,852
Prepaid expenses and other	6,167
Property and equipment	8,877
Goodwill	166,288
Other intangible assets	102,658
Notes and other liabilities assumed	(41,598)
Deferred tax liabilities	(46,481)
Purchase price	206,763
Allstar Business Solutions Limited [Member]
Business Acquisition [Line Items]
Trade and other receivables		253,628
Prepaid expenses and other		139
Property and equipment		601
Goodwill		106,279
Other intangible assets		168,200
Notes and other liabilities assumed		(176,327)
Deferred tax liabilities		(40,357)
Purchase price		$ 312,163