Common Stock and Preferred Stock - Additional Information (Detail)	1 Months Ended			9 Months Ended
	Mar. 31, 2016 USD ($) shares	Jan. 31, 2016 USD ($) ExecutiveOfficers Director shares	Jun. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2016 USD ($) shares	May 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Class of Stock [Line Items]
Repurchase of common stock, shares | shares			3,112,840
Repurchase of common stock, average price per share | $ / shares			$ 7.71
Repurchase of common stock, value			$ 24,000,000
Repurchase of convertible senior notes				$ 2,626,000
4.875% Convertible Senior Notes (due 2020)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired		$ 2,000,000
4.25% Convertible Senior Notes (due 2018)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired					$ 700,000	$ 700,000
Securities
Class of Stock [Line Items]
Retirement of common stock (share) | shares				3,313,645
Retirement of common stock				$ 26,700,000
Stock repurchase, remaining authorized amount				700,000
Securities | 4.875% Convertible Senior Notes (due 2020)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired				2,000,000
Repurchase of convertible senior notes				1,940,000
Securities | 4.25% Convertible Senior Notes (due 2018)
Class of Stock [Line Items]
Amount of convertible notes repurchased and retired				695,000
Repurchase of convertible senior notes				$ 685,887
Maximum | Restricted Stock
Class of Stock [Line Items]
Vesting period				5 years
Maximum | Securities
Class of Stock [Line Items]
Stock repurchase, authorized amount							$ 30,000,000
Executive officer
Class of Stock [Line Items]
Restricted stock issued, shares | shares	134,058	449,120
Restricted stock issued, value	$ 900,000	$ 3,600,000
Number of executive officers | ExecutiveOfficers		2
Executive officer | Restricted Stock
Class of Stock [Line Items]
Vesting period	3 years	3 years
Non-employee directors
Class of Stock [Line Items]
Restricted stock issued, shares | shares		62,710
Restricted stock issued, value		$ 500,000
Number of non-employee directors | Director		5
Non-employee directors | Restricted Stock
Class of Stock [Line Items]
Shares of restricted stock, vesting date		2016-01