Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Loss and tax credit carryforwards	$ 12,300
Net long-term deferred income tax liabilities	57,258	67,404
Long-term deferred income tax (liabilities) assets
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Intangibles	(77,347)	80,372
Depreciation on plant and equipment	25,322	33,037
Deferred compensation	20,726	20,008
Cancellation of indebtedness income	3,833	3,830
Loss and tax credit carryforwards	12,288	7,316
Stock compensation	4,065	4,552
Partnership losses	0	2,603
Investment impairments	5,233	5,202
Foreign	299	315
Acquisition costs	13,425	13,634
Interest rate swaps	2,198	2,083
Allowance for uncollectible accounts	1,067	1,288
Other reserves	(7,441)	(8,958)
Long-term deferred income tax liabilities	(39,760)	(51,280)
Valuation allowance, noncurrent	(17,498)	(16,124)
Net long-term deferred income tax liabilities	57,258	67,404
Current deferred income tax (liabilities) assets
Schedule of Deferred Tax Assets and Liabilities [Line Items]
Intangibles	5,940	4,976
Allowance for uncollectible accounts	6,469	7,972
Other reserves	(46)	203
Inventory	815	622
Accrued expense	3,770	5,141
Prepaid expense	3,473	3,465
Current deferred income tax assets:	1,687	5,091
Valuation allowance, current	(1,536)	(1,731)
Net current deferred income tax assets	$ 151	$ 3,360