Earnings Per Share - Additional Information (Detail) - shares	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Earnings Per Share [Abstract]
Common stock, shares outstanding (shares)	28,130,508	21,402,990	21,402,990
Common stock, shares issued (shares)	28,130,508	21,402,990	21,402,990