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
	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Proceeds	$ 2,055	$ 1,373
Available-for-sale securities, Gains	110	42
Available-for-sale securities, Losses	(2)	(193)
Epoch U.S. Equity Shareholder Yield separate account [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Proceeds	55
Available-for-sale securities, Gains	2
Available-for-sale securities, Losses	(2)
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
Epoch Global All Cap separate account [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Proceeds		1,373
Available-for-sale securities, Gains		42
Available-for-sale securities, Losses		$ (193)