Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Loss and tax credit carryforwards	$ 7,300
Long-term deferred income tax liabilities	(51,280)	(63,160)
Valuation allowance, noncurrent	(16,124)	(15,604)
Net long-term deferred income tax liabilities	(67,404)	(78,764)
Current deferred income tax assets:	5,091	6,860
Valuation allowance, current	(1,731)	(2,278)
Net current deferred income tax assets	3,360	4,582
Long-term deferred income tax (liabilities) assets
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Intangibles	(80,372)	(85,538)
Depreciation on plant and equipment	(33,037)	(36,826)
Deferred compensation	20,008	17,537
Cancellation of indebtedness income	(3,830)	(3,858)
Loss and tax credit carryforwards	7,316	5,957
Stock compensation	4,552	3,510
Partnership losses	2,603	2,849
Investment impairments	5,202	5,663
Foreign	315	285
Acquisition costs	13,634	13,778
Interest rate swaps	2,083	1,752
Allowance for uncollectible accounts	1,288	1,397
Other reserves	8,958	10,334
Current deferred income tax (liabilities) assets
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Intangibles	(4,976)	(3,560)
Inventory	622	894
Accrued expense	5,141	5,501
Allowance for uncollectible accounts	7,972	9,306
Other reserves	(203)	(794)
Prepaid expense	$ (3,465)	$ (4,487)