Shareholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	12 Months Ended
	Feb. 16, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2011
Shareholders Equity [Line Items]
Follow-on public stock offering, price per share (in usd per share)	$ 17.75
Proceeds from follow-on public stock offering, net	$ 93,605	$ 0	$ 0	$ 93,605
Preferred stock shares authorized to issue		1,000,000	1,000,000
Preferred stock shares par value		$ 0.01	$ 0.01
Dividend declared, record date		Dec. 23, 2005
Minimum percentage a person should acquire or commence a tender offer that would result in owning outstanding shares of common stock to exercise the right		15.00%
Underwriting Discount
Shareholders Equity [Line Items]
Underwriting discount and other expenses related to follow-on public stock offering	4,950
Other Expense
Shareholders Equity [Line Items]
Underwriting discount and other expenses related to follow-on public stock offering	$ 446
Common Stock
Shareholders Equity [Line Items]
Follow-on public stock offering, shares	5,578,000