Earnings Per Share - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Six point two five percent convertible notes due two thousand eighteen excluded from computation of earnings per share [Member]
Number of shares excluded from computation of earnings per share [Line Items]
Interest rate of convertible notes	6.25%		6.25%
Maturity year of convertible notes			May 01, 2018
Shares received upon conversion			97.2668
Principal amount for initial conversion	$ 1,000		$ 1,000
Initial conversion price	$ 10.28		$ 10.28
Convertible note, convertible beginning date			Feb. 01, 2018
Convertible Notes Payable [Member]
Number of shares excluded from computation of earnings per share [Line Items]
Anti-dilutive shares excluded from calculation	9,143,000	11,088,000	9,298,000	11,088,000