Schedule of Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]
Total current assets	$ 3,091,410	$ 2,274,429
Intangible assets, net	828,318	743,898
Goodwill	3,006,962	2,877,301
Other assets, net	580,875	609,630
TOTAL ASSETS	7,507,565	6,505,258
Total current liabilities	3,298,579	2,553,357
Long-term debt	1,249,328	1,249,281
Other liabilities	487,349	397,453
Stockholders' equity	2,472,309	2,305,167
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,507,565	6,505,258
Parent Company
Condensed Financial Statements, Captions [Line Items]
Total current assets	135,432	551,488
Investment in subsidiaries	4,244,307	3,891,811
Other assets, net	4,973	5,587
TOTAL ASSETS	4,384,712	4,448,886
Total current liabilities	663,075	894,438
Long-term debt	1,249,328	1,249,281
Stockholders' equity	2,472,309	2,305,167
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	4,384,712	4,448,886
Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total current assets	2,805,523	1,538,509
Investment in subsidiaries	1,284,243	1,126,412
Intangible assets, net	636,408	634,581
Goodwill	2,436,533	2,415,482
Other assets, net	430,119	465,473
TOTAL ASSETS	7,592,826	6,180,457
Total current liabilities	2,988,327	1,906,349
Other liabilities	354,238	378,729
Stockholders' equity	4,250,261	3,895,379
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,592,826	6,180,457
Non-Guarantor Subsidiaries
Condensed Financial Statements, Captions [Line Items]
Total current assets	918,942	644,825
Intangible assets, net	191,910	109,317
Goodwill	570,429	461,819
Other assets, net	145,783	138,570
TOTAL ASSETS	1,827,064	1,354,531
Total current liabilities	415,664	212,963
Other liabilities	133,111	18,724
Stockholders' equity	1,278,289	1,122,844
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,827,064	1,354,531
Eliminations
Condensed Financial Statements, Captions [Line Items]
Total current assets	(768,487)	(460,393)
Investment in subsidiaries	(5,528,550)	(5,018,223)
TOTAL ASSETS	(6,297,037)	(5,478,616)
Total current liabilities	(768,487)	(460,393)
Stockholders' equity	(5,528,550)	(5,018,223)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (6,297,037)	$ (5,478,616)