Fair Value of Financial Instruments - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015
Level 1
Assets:
Fair value measurement disclosure	$ 66,784
Level 2
Assets:
Fair value measurement disclosure	0
Level 3
Assets:
Fair value measurement disclosure	0
Cash and cash equivalents | Level 1
Assets:
Fair value measurement disclosure	66,520
Cash and cash equivalents | Level 2
Assets:
Fair value measurement disclosure	0
Cash and cash equivalents | Level 3
Assets:
Fair value measurement disclosure	0
Restricted cash | Level 1
Assets:
Fair value measurement disclosure	264
Restricted cash | Level 2
Assets:
Fair value measurement disclosure	0
Restricted cash | Level 3
Assets:
Fair value measurement disclosure	0
Fair Value
Assets:
Fair value measurement disclosure	66,784
Fair Value | Cash and cash equivalents
Assets:
Fair value measurement disclosure	66,520
Fair Value | Restricted cash
Assets:
Fair value measurement disclosure	$ 264