FAIR VALUE MEASUREMENTS - Additional Information (Detail) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration	$ 12,005,000	$ 9,921,000
Debt obligation, fair value	1,360,000,000	1,410,000,000
Debt obligation, carrying value	1,341,807,000	1,384,639,000
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent liability	15,600,000
Level 3 Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration	$ 12,005,000	$ 9,921,000

Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares.

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+ Details