Deferred Tax Liabilities and Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred tax liabilities:
Property, plant and equipment	$ (37,112)	$ (34,699)
Goodwill and intangibles	(357,453)	(318,624)
Total deferred tax liabilities	(394,565)	(353,323)
Deferred tax assets:
Accrued liabilities	24,251	22,124
Other	23,896	22,296
Net operating tax loss carry-forwards	12,973	18,259
Less: operating tax loss valuation allowance	(3,340)	(3,775)	(11,973)	(7,249)
Total deferred tax assets	57,780	58,904
Net deferred tax liabilities	$ (336,785)	$ (294,419)