Description of Business and Accounting Policies - Reconciliation of Number of Shares Used in Calculation of Basic and Diluted Income (Loss) Per Share (Detail) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Weighted average shares outstanding for basic income per share	12,047	11,959	11,856	11,778	11,735	11,655	11,510	11,390	11,938	11,574
Dilutive effect of common stock equivalent shares									481	214
Weighted average shares outstanding for diluted income per share	12,649	12,466	12,295	12,057	11,945	11,832	11,715	11,390	12,419	11,788