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, 2014
Assets:
Fair value measurement disclosure	$ 46,256
Fair Value, Inputs, Level 1 [Member]
Assets:
Fair value measurement disclosure	46,256
Fair Value, Inputs, Level 2 [Member]
Assets:
Fair value measurement disclosure	0
Fair Value, Inputs, Level 3 [Member]
Assets:
Fair value measurement disclosure	0
Cash and cash equivalents
Assets:
Fair value measurement disclosure	45,710
Cash and cash equivalents | Fair Value, Inputs, Level 1 [Member]
Assets:
Fair value measurement disclosure	45,710
Cash and cash equivalents | Fair Value, Inputs, Level 2 [Member]
Assets:
Fair value measurement disclosure	0
Cash and cash equivalents | Fair Value, Inputs, Level 3 [Member]
Assets:
Fair value measurement disclosure	0
Restricted cash
Assets:
Fair value measurement disclosure	546
Restricted cash | Fair Value, Inputs, Level 1 [Member]
Assets:
Fair value measurement disclosure	546
Restricted cash | Fair Value, Inputs, Level 2 [Member]
Assets:
Fair value measurement disclosure	0
Restricted cash | Fair Value, Inputs, Level 3 [Member]
Assets:
Fair value measurement disclosure	$ 0