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, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Weighted average shares outstanding for basic income (loss) per share	12,473	12,310	12,152	12,102	12,047	11,959	11,856	11,778	12,260	11,938
Dilutive effect of common stock equivalent shares										481
Weighted average shares outstanding for diluted income (loss) per share	12,473	12,310	12,152	12,531	12,649	12,466	12,295	12,057	12,260	12,419