NET INCOME PER SHARE - Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Basic net income per share:
Net income (loss)	$ 4,825	$ 1,520	[1]	$ 7,031	$ (4,508)	[1]
Weighted average common shares outstanding (in shares)	32,398	27,873	[1]	32,336	27,834	[1]
Basic net income per common share (in dollars per share)	$ 0.15	$ 0.05	[1]	$ 0.22	$ (0.16)	[1]
Diluted net income per share:
Net income (loss)	$ 4,825	$ 1,520	[1]	$ 7,031	$ (4,508)	[1]
Weighted average common shares outstanding (in shares)	32,398	27,873	[1]	32,336	27,834	[1]
Effect of dilutive securities:
Stock options and restricted stock (in shares)	406	245		460	0
Weighted average common shares for diluted earnings per share (in shares)	32,804	28,118	[1]	32,796	27,834	[1]
Diluted net income per common share (in dollars per share)	$ 0.15	$ 0.05	[1]	$ 0.21	$ (0.16)	[1]

[1] See Note 1 of these condensed consolidated financial statements for discussion of the impact of the change in accounting for the medical device excise tax.