ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Accrued Expense) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Accrued Liabilities Current Abstract
Accrued compensation	$ 65,983	$ 67,249
Accrued commissions	9,122	7,568
Interest Payable, Current	4,282	3,231
Accrued taxes other than income taxes	4,088	2,163
Accrued insurance	5,817	5,108
Other Accrued Liabilities Current	15,904	14,647
Accrued expenses	$ 105,196	$ 99,966