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Fair Value of Financial Instruments - Additional Information (Detail) (USD $)
 6 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Fair Value Disclosures [Abstract]    
Transfers between levels $ 0br_FairValueMeasurementsTransfersBetweenLevels $ 0br_FairValueMeasurementsTransfersBetweenLevels