Marketable Securities - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items]
Marketable securities purchased	$ 2,053	$ 2,535
Marketable securities matured	$ 7,500	$ 2,000
Weighted average maturity	2 months 9 days
Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities maturity period	3 days
Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable securities maturity period	7 months