Earnings per Share - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2015	Jun. 30, 2015
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Each share convertible into shares	69
Redemption of preferred stock, shares		2,367
Redemption of preferred stock		$ 2,367
Series A Preferred Stock
Calculation For Basic And Diluted Earnings Per Common Share [Line Items]
Dividend Rate	6.00%
Number of preferred stock converted	12,784
Redemption of preferred stock, shares	2,367
Redemption of preferred stock	$ 2,370
Accrued and unpaid dividends	$ 9