FAIR VALUE MEASUREMENTS - Additional Information (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	$ 15,807,000	$ 18,511,000
Debt obligations, carrying amount	1,272,700,000	1,356,084,000
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maximum contingent liability if financial performance measures were fully met	18,000,000
Level 3 Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	15,807,000	18,511,000
Contingent consideration liabilities, current	9,900,000
Level 2 Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	0	0
Debt obligations, fair value	$ 1,310,000,000	$ 1,390,000,000

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

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+ Details