Computation of Basic and Diluted Net Income Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Basic EPS
Net income attributable to common stockholders	$ 4,353	$ 1,256
Effect of Dilutive Securities
Preferred Stock
Stock options
Diluted EPS
Net income attributable to common stockholders	$ 4,353	$ 1,256
Basic EPS, Shares
Net income attributable to common stockholders, shares	55,210	31,364
Effect of Dilutive Securities, shares
Preferred Stock, shares	19,284	11,186
Stock options, shares	3,141	596
Diluted EPS, shares
Net income attributable to common stockholders plus assumed conversions, shares	77,635	43,146
Basic EPS, per share amount
Net income attributable to common stockholders, per share amount	$ 0.08	$ 0.04
Diluted EPS, per share amount
Net income attributable to common stockholders plus assumed conversions, per share amount	$ 0.06	$ 0.03