Earnings and Dividends per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Basic net income and earnings per share, Numerator (Income)	$ 3,100	$ 198
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan, Numerator (Income)	0	0
Diluted earnings and earnings per share, Numerator (Income)	$ 3,100	$ 198
Basic net income and earnings per share, Denominator (Shares)	33,928,052	26,271,316
Common stock equivalents arising from stock options, restricted stock awards, and employee stock purchase plan, Denominator (Shares)	189,000	390,000
Diluted earnings and earnings per share, Denominator (Shares)	34,116,534	26,660,595
Basic net income and earning per share, Per Share Amount	$ 0.09	$ 0.01
Diluted earning and earning per share, Per Share Amount	$ 0.09	$ 0.01