Commitments and Contingencies - Additional Information (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Long Term Purchase Commitment [Line Items]
Unconditional purchase obligations, term	3 years
Unconditional purchase obligations	$ 82,026
Bank of America, N.A.
Long Term Purchase Commitment [Line Items]
Amount outstanding under letters of credit	$ 1,149
Minimum
Long Term Purchase Commitment [Line Items]
Unconditional purchase obligations, term	1 year
Maximum
Long Term Purchase Commitment [Line Items]
Unconditional purchase obligations, term	3 years