Schedule of Weighted Average Shares Outstanding (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accounting Policies [Abstract]
Weighted average number of shares outstanding - basic	33,197	33,004	33,059	32,871
Stock options	181	1	134	0
Non-vested stock and stock units	330	454	448	0
Weighted average number of shares outstanding - diluted	33,708	33,459	33,641	32,871
Anti-dilutive securities	199	514	240	957