Schedule of Balance Sheet Information (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Total current assets	$ 2,980,871	$ 2,614,502
Intangible assets, net	1,163,828	821,419
Goodwill	3,642,098	3,015,670
Other assets, net	645,623	633,604
TOTAL ASSETS	8,432,420	7,085,195
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	3,984,307	2,982,311
Long-term debt	1,249,361	1,249,345
Other liabilities	928,521	464,151
Stockholders' equity	2,270,231	2,389,388
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	8,432,420	7,085,195
Parent
ASSETS
Total current assets	147,888	137,942
Investment in subsidiaries	4,224,101	4,277,954
Other assets, net	4,611	4,790
TOTAL ASSETS	4,376,600	4,420,686
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	857,008	781,953
Long-term debt	1,249,361	1,249,345
Stockholders' equity	2,270,231	2,389,388
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	4,376,600	4,420,686
Guarantor Subsidiaries
ASSETS
Total current assets	3,526,996	2,674,496
Investment in subsidiaries	1,134,987	1,188,871
Intangible assets, net	633,540	634,853
Goodwill	2,436,533	2,436,533
Other assets, net	471,610	473,439
TOTAL ASSETS	8,203,666	7,408,192
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	3,559,520	2,708,755
Other liabilities	412,662	415,465
Stockholders' equity	4,231,484	4,283,972
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	8,203,666	7,408,192
Non-Guarantor Subsidiaries
ASSETS
Total current assets	147,425	675,026
Intangible assets, net	530,288	186,566
Goodwill	1,205,565	579,137
Other assets, net	169,402	155,375
TOTAL ASSETS	2,052,680	1,596,104
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	409,217	364,565
Other liabilities	515,859	48,686
Stockholders' equity	1,127,604	1,182,853
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	2,052,680	1,596,104
Eliminations
ASSETS
Total current assets	(841,438)	(872,962)
Investment in subsidiaries	(5,359,088)	(5,466,825)
TOTAL ASSETS	(6,200,526)	(6,339,787)
LIABILITIES AND STOCKHOLDERS' EQUITY
Total current liabilities	(841,438)	(872,962)
Stockholders' equity	(5,359,088)	(5,466,825)
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ (6,200,526)	$ (6,339,787)