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Acquisitions - Consideration (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Business Combinations [Abstract]  
Gain on Change in Control of Interests $ 14,279us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
Carrying value of previously held equity interest 1,401us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeFairValue1
Total consideration $ 15,680us-gaap_BusinessCombinationConsiderationTransferred1