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Commitment and Contingencies - Summary of Remaining Unconditional Purchase Obligation (Detail)
$ in Millions
Jun. 30, 2015
USD ($)
Unrecorded Unconditional Purchase Obligation [Line Items]  
Commitment for unconditional purchase obligations, 2016 $ 21.3
Commitment for unconditional purchase obligations, 2017 12.1
Total commitment for unconditional purchase obligations $ 33.4