Schedule of Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
ASSETS
Total current assets	$ 2,705,806	$ 2,614,502
Intangible assets, net	1,129,531	821,419
Goodwill	3,657,994	3,015,670
Other assets, net	708,279	633,604
TOTAL ASSETS	8,201,610	7,085,195
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	3,721,419	2,982,311
Long-term debt	1,249,395	1,249,345
Other liabilities	925,490	464,151
Stockholders' equity	2,305,306	2,389,388
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	8,201,610	7,085,195
Parent
ASSETS
Total current assets	150,112	137,942
Investment in subsidiaries	4,499,392	4,277,954
Other assets, net	4,249	4,790
TOTAL ASSETS	4,653,753	4,420,686
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	1,099,052	781,953
Long-term debt	1,249,395	1,249,345
Stockholders' equity	2,305,306	2,389,388
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	4,653,753	4,420,686
Guarantor Subsidiaries
ASSETS
Total current assets	3,407,256	2,674,496
Investment in subsidiaries	1,307,092	1,188,871
Intangible assets, net	638,015	634,853
Goodwill	2,436,533	2,436,533
Other assets, net	529,406	473,439
TOTAL ASSETS	8,318,302	7,408,192
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	3,394,877	2,708,755
Other liabilities	413,452	415,465
Stockholders' equity	4,509,973	4,283,972
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	8,318,302	7,408,192
Non-Guarantor Subsidiaries
ASSETS
Total current assets	383,210	675,026
Intangible assets, net	491,516	186,566
Goodwill	1,221,461	579,137
Other assets, net	174,624	155,375
TOTAL ASSETS	2,270,811	1,596,104
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	462,262	364,565
Other liabilities	512,038	48,686
Stockholders' equity	1,296,511	1,182,853
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,270,811	1,596,104
Eliminations
ASSETS
Total current assets	(1,234,772)	(872,962)
Investment in subsidiaries	(5,806,484)	(5,466,825)
TOTAL ASSETS	(7,041,256)	(6,339,787)
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	(1,234,772)	(872,962)
Stockholders' equity	(5,806,484)	(5,466,825)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (7,041,256)	$ (6,339,787)