Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2013
Related Party Transaction [Line Items]
Available-for-sale securities, fair value	[1],[2]	$ 4,263	$ 6,196
USGIF and offshore clients [Member]
Related Party Transaction [Line Items]
Fair Value investment included in Cash and Cash Equivalents and trading securities		17,100	19,400
Dividend income		157	132	$ 114
Unrealized gain (losses) on related party securities		(846)	(143)	$ (147)
Chief Executive Officer, Trustee of USGIF [Member]
Related Party Transaction [Line Items]
Investment advisory fees receivable		701	1,300
Charlemagne Capital Limited [Member]
Related Party Transaction [Line Items]
Available-for-sale securities, fair value		$ 864	$ 1,314

[1] Net unrealized gains (losses) on available-for-sale securities gross and net of tax as of June 30, 2015, are $(339) and $(339), respectively, and as of June 30, 2014, are $1,345 and $888, respectively.

[2] Unrealized gains and losses on available-for-sale securities are excluded from earnings and recorded in other comprehensive income (loss) as a separate component of shareholders’ equity until realized.