Schedule of Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Total current assets	$ 2,614,502	$ 2,274,429
Intangible assets, net	821,419	743,898
Goodwill	3,015,670	2,877,301	2,864,664
Other assets, net	633,604	609,630
TOTAL ASSETS	7,085,195	6,505,258
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	2,982,311	2,553,357
Long-term debt	1,249,345	1,249,281
Other liabilities	464,151	397,453
Stockholders' equity	2,389,388	2,305,167	2,736,703	2,749,726
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,085,195	6,505,258
Parent
ASSETS
Total current assets	137,942	551,488
Investment in subsidiaries	4,277,954	3,891,811
Other assets, net	4,790	5,587
TOTAL ASSETS	4,420,686	4,448,886
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	781,953	894,438
Long-term debt	1,249,345	1,249,281
Stockholders' equity	2,389,388	2,305,167
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	4,420,686	4,448,886
Guarantor Subsidiaries
ASSETS
Total current assets	2,674,496	1,538,509
Investment in subsidiaries	1,188,871	1,126,412
Intangible assets, net	634,853	634,581
Goodwill	2,436,533	2,415,482
Other assets, net	473,439	465,473
TOTAL ASSETS	7,408,192	6,180,457
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	2,708,755	1,906,349
Other liabilities	415,465	378,729
Stockholders' equity	4,283,972	3,895,379
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	7,408,192	6,180,457
Non-Guarantor Subsidiaries
ASSETS
Total current assets	675,026	644,825
Intangible assets, net	186,566	109,317
Goodwill	579,137	461,819
Other assets, net	155,375	138,570
TOTAL ASSETS	1,596,104	1,354,531
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	364,565	212,963
Other liabilities	48,686	18,724
Stockholders' equity	1,182,853	1,122,844
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	1,596,104	1,354,531
Eliminations
ASSETS
Total current assets	(872,962)	(460,393)
Investment in subsidiaries	(5,466,825)	(5,018,223)
TOTAL ASSETS	(6,339,787)	(5,478,616)
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	(872,962)	(460,393)
Stockholders' equity	(5,466,825)	(5,018,223)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (6,339,787)	$ (5,478,616)