Earnings and Dividends per Share - Number of Shares Outstanding for Calculation of Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share [Abstract]
Basic net income and earnings per share, Numerator (Income)	$ 198	$ 3,021
Common stock equivalents arising from stock options and employee stock purchase plan, Numerator (Income)	0	0
Diluted earnings (loss) and earnings (loss) per share, Numerator (Income)	$ 198	$ 3,021
Basic net income and earnings per share, Denominator (Shares)	26,271,316	25,606,352
Common stock equivalents arising from stock options and employee stock purchase plan, Denominator (Shares)	390,000	509,000
Diluted earnings and per share, Denominator (Shares)	26,660,595	26,115,512
Basic net income and earnings per share, Per Share Amount	$ 0.01	$ 0.12
Common stock equivalents arising from stock options and employee stock purchase plan, Per Share Amount	$ 0	$ 0
Diluted earnings and earnings per share, Per Share Amount	$ 0.01	$ 0.12