Schedule of Weighted Average Shares Outstanding (Detail) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accounting Policies [Abstract]
Weighted average number of shares outstanding - basic	32,251	31,160	32,058	30,900
Stock options	0	12	0	17
Non-vested stock and stock units	343	317	0	381
Weighted average number of shares outstanding - diluted	32,594	31,489	32,058	31,298
Anti-dilutive securities	192	217	649	217