Investments - Amortized Cost and Fair Value of Investments by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014
Amortized cost
Debt securities due within one year	$ 875
Debt securities due within one to five years	10,784
Debt securities due within five years or more	5,666
Total	17,325
Fair value
Debt securities due within one year	882
Debt securities due within one to five years	10,823
Debt securities due within five years or more	5,674
Total	$ 17,379