Supplemental Guarantor Financial Information (Condensed Consolidating Balance Sheets) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets
Current assets	$ 1,047,068	$ 828,804
Current assets of discontinued operations	18,591	30,608	43,100
Property and equipment, net	350,355	263,007
Goodwill and other intangible assets, net	957,441	825,467	596,500
Net investments in and advances to (from) consolidated affiliates	0	0
Other assets	45,422	55,732
Long-term assets of discontinued operations	7,648	121,695	104,000
Total assets	2,407,934	2,094,705	1,655,800
Liabilities and Shareholders' Equity
Current liabilities	705,702	592,445
Current liabilities of discontinued operations	4,569	29,274
Long-term debt	546,323	460,690
Other liabilities	293,974	230,363
Total liabilities	1,545,999	1,283,498
Total shareholders' equity	861,935	811,207	653,162	528,162
Total liabilities and shareholders' equity	2,407,934	2,094,705
Parent Company [Member]
Assets
Current assets of discontinued operations	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Net investments in and advances to (from) consolidated affiliates	854,993	811,982
Other assets	7,702	7,119
Long-term assets of discontinued operations	0	0
Total assets	862,695	819,101
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	0	0
Long-term debt	0	0
Other liabilities	0	0
Total liabilities	22	0
Total shareholders' equity	862,673	819,101
Total liabilities and shareholders' equity	862,695	819,101
Guarantor Subsidiaries [Member]
Assets
Current assets of discontinued operations	13,836	22,572
Property and equipment, net	338,974	251,948
Goodwill and other intangible assets, net	926,712	793,832
Net investments in and advances to (from) consolidated affiliates	172,534	117,963
Other assets	37,640	47,580
Long-term assets of discontinued operations	4,711	114,378
Total assets	2,474,511	2,093,141
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	574	20,912
Long-term debt	546,262	460,603
Other liabilities	273,198	209,225
Total liabilities	1,498,335	1,224,646
Total shareholders' equity	976,176	868,495
Total liabilities and shareholders' equity	2,474,511	2,093,141
Non-Guarantor Subsidiaries [Member]
Assets
Current assets of discontinued operations	4,755	8,036
Property and equipment, net	11,381	11,059
Goodwill and other intangible assets, net	30,729	31,635
Net investments in and advances to (from) consolidated affiliates	(21,779)	(41,830)
Other assets	80	1,033
Long-term assets of discontinued operations	2,937	7,317
Total assets	76,476	70,578
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	3,995	8,362
Long-term debt	61	87
Other liabilities	20,776	21,138
Total liabilities	47,642	58,852
Total shareholders' equity	28,834	11,726
Total liabilities and shareholders' equity	76,476	70,578
Consolidation, Eliminations [Member]
Assets
Current assets of discontinued operations	0	0
Property and equipment, net	0	0
Goodwill and other intangible assets, net	0	0
Net investments in and advances to (from) consolidated affiliates	(1,005,748)	(888,115)
Other assets	0	0
Long-term assets of discontinued operations	0	0
Total assets	(1,005,748)	(888,115)
Liabilities and Shareholders' Equity
Current liabilities of discontinued operations	0	0
Long-term debt	0	0
Other liabilities	0	0
Total liabilities	0	0
Total shareholders' equity	(1,005,748)	(888,115)
Total liabilities and shareholders' equity	(1,005,748)	(888,115)
Segment, Continuing Operations [Member]
Assets
Current assets	1,028,477	798,196
Total assets	2,381,700	1,942,400	1,508,700
Liabilities and Shareholders' Equity
Current liabilities	701,133	563,171
Segment, Continuing Operations [Member] | Parent Company [Member]
Assets
Current assets	0	0
Liabilities and Shareholders' Equity
Current liabilities	22	0
Segment, Continuing Operations [Member] | Guarantor Subsidiaries [Member]
Assets
Current assets	980,104	744,868
Liabilities and Shareholders' Equity
Current liabilities	678,301	533,906
Segment, Continuing Operations [Member] | Non-Guarantor Subsidiaries [Member]
Assets
Current assets	48,373	53,328
Liabilities and Shareholders' Equity
Current liabilities	22,810	29,265
Segment, Continuing Operations [Member] | Consolidation, Eliminations [Member]
Assets
Current assets	0	0
Liabilities and Shareholders' Equity
Current liabilities	$ 0	$ 0