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Fair Value Measurements - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Fair Value Disclosures [Abstract]
Fair Value Measurements, Inter-transfers between Levels	$ 0	$ 0
Business Combination Contingent Consideration Liability Extended Term	3 years

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Business combination contingent consideration liability extended term.

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- Definition

Fair value measurements inter transfers between levels.

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