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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2012
Commitment And Contingencies [Line Items]          
Rent expense for office space and equipment $ 0.8 $ 0.8 $ 1.6 $ 1.7  
Estimated fair value of indemnification agreements             
Fair value of indemnity provisions