Schedule of Weighted Average Shares Outstanding (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Accounting Policies [Abstract]
Weighted average number of shares outstanding - basic	33,309	33,128	33,142	32,957
Stock options	207	57	156	0
Non-vested stock and stock units	307	446	401	0
Weighted average number of shares outstanding - diluted	33,823	33,631	33,699	32,957
Anti-dilutive securities	204	89	254	983