Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring, USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Fair Value
Assets:
Fair value measurement disclosure	$ 47,552	$ 39,672
Fair Value | U.S. Treasury bills and money market funds
Assets:
Fair value measurement disclosure		27,023
Fair Value | Operating cash
Assets:
Fair value measurement disclosure	47,287	12,103
Fair Value | Restricted cash
Assets:
Fair value measurement disclosure	265	546
Level 1
Assets:
Fair value measurement disclosure	47,552	39,672
Level 1 | U.S. Treasury bills and money market funds
Assets:
Fair value measurement disclosure		27,023
Level 1 | Operating cash
Assets:
Fair value measurement disclosure	47,287	12,103
Level 1 | Restricted cash
Assets:
Fair value measurement disclosure	265	546
Level 2
Assets:
Fair value measurement disclosure	0	0
Level 2 | U.S. Treasury bills and money market funds
Assets:
Fair value measurement disclosure		0
Level 2 | Operating cash
Assets:
Fair value measurement disclosure	0	0
Level 2 | Restricted cash
Assets:
Fair value measurement disclosure	0	0
Level 3
Assets:
Fair value measurement disclosure	0	0
Level 3 | U.S. Treasury bills and money market funds
Assets:
Fair value measurement disclosure		0
Level 3 | Operating cash
Assets:
Fair value measurement disclosure	0	0
Level 3 | Restricted cash
Assets:
Fair value measurement disclosure	$ 0	$ 0