Earnings Per Share (Reconciliation of Weighted Average Shares Used to Determine Basic and Diluted Earnings Per Share) (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Basic average common shares outstanding (in shares)	16,746	16,662	16,570
Effect of dilutive options and restricted stock awards (in shares)	338	341	296
Diluted average common shares outstanding (in shares)	17,084	17,003	16,866