Shareholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 16, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2010
Shareholders Equity [Line Items]
Follow-on public stock offering, price per share	$ 17.75
Proceeds from follow-on public stock offering, net	$ 93,605		$ 93,605
Preferred stock shares authorized to issue		1,000,000	1,000,000
Preferred stock shares par value		$ 0.01	$ 0.01
Number of preferred stock purchase right declared as dividend for each outstanding share of common stock		1
Dividend declared, record date		Dec. 23, 2005
Shareholder Rights Plan description		Under the Shareholder Rights Plan, the Rights become exercisable if a person becomes an "acquiring person" by acquiring 15% or more of the outstanding shares of common stock or if a person commences a tender offer that would result in that person owning 15% or more of the common stock. If a person becomes an "acquiring person," each holder of a Right (other than the acquiring person) would be entitled to purchase, at the then-current exercise price, such number of shares of the Company's preferred stock which are equivalent to shares of common stock having a value of twice the exercise price of the Right.
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%
Net settled shares in connection with surrender of shares to cover minimum taxes on vesting of restricted stock, shares				42,000
Net settled shares in connection with surrender of shares to cover minimum taxes on vesting of restricted stock, value				433
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