Available-for-sale Securities - Summary of Proceeds as Well as Realized Gains and Losses on Investments Classified as Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Proceeds	$ 196	$ 281	$ 2,251	$ 1,654
Available-for-sale securities, Gains	90	45	200	100
Available-for-sale securities, Losses	(10)	(49)	(12)	(254)
Epoch U.S. Equity Shareholder Yield separate account [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Proceeds	112		167
Available-for-sale securities, Gains	6		8
Available-for-sale securities, Losses	(10)		(12)
Company-sponsored mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Proceeds	84	20	84	20
Available-for-sale securities, Gains	84	20	84	20
Available-for-sale securities, Losses
Epoch Global All Cap separate account [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Proceeds		261		1,634
Available-for-sale securities, Gains		25		80
Available-for-sale securities, Losses		(49)		(254)
Investment in non-affiliated limited partnership [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Proceeds			2,000
Available-for-sale securities, Gains			108
Available-for-sale securities, Losses