Acquisitions (Summary of Purchase Price Allocation) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Other intangible assets	$ 109,758	$ 168,200	$ 13,502
ALL 2010 Acquisitions [Member]
Business Acquisition [Line Items]
Trade and other receivables			914
Prepaid expenses and other			5,378
Property and equipment			70
Goodwill			11,330
Other intangible assets			13,502
Notes and other liabilities assumed			(20,361)
Purchase price			10,833
All 2012 Acquisitions [Member]
Business Acquisition [Line Items]
Trade and other receivables	13,196
Prepaid expenses and other	6,185
Property and equipment	6,701
Goodwill	165,398
Other intangible assets	109,758
Notes and other liabilities assumed	(42,912)
Deferred tax liabilities	(50,936)
Purchase price	207,390
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		110,736
Other intangible assets		168,200
Notes and other liabilities assumed		(182,460)
Deferred tax liabilities		(39,614)
Purchase price		$ 311,830