FAIR VALUE MEASUREMENTS - Additional Information (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	$ 16,559,000	$ 18,511,000
Debt obligations, carrying amount	1,318,633,000	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	17,500,000
Level 3 Inputs
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Contingent consideration liabilities	16,559,000	18,511,000
Contingent consideration liabilities, current	10,900,000
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