Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
Net income		$ 49,557	$ 38,077	$ 24,263
Preferred stock tax distributions				(320)
Basic EPS
Net income attributable to common stockholders		49,557	38,077	23,943
Effect of Dilutive Securities
Preferred stock				320
Diluted EPS
Net income attributable to common stockholders		$ 49,557	$ 38,077	$ 24,263
Basic EPS, Shares
Weighted average number of shares outstanding, basic		85,069	84,076	73,571
Effect of Dilutive Securities, shares
Preferred stock, shares	[1]			4,980
Diluted EPS, shares
Weighted average number of shares outstanding, diluted		86,135	85,706	81,698
Basic EPS, per share amount
Net income attributable to common stockholders, per share amount		$ 0.58	$ 0.45	$ 0.33
Diluted EPS, per share amount
Net income attributable to common stockholders plus assumed conversions, per share amount		$ 0.58	$ 0.44	$ 0.30
Restricted Stock Units and Restricted Stock Awards
Effect of Dilutive Securities, shares
Stock options, Restricted stock units and restricted stock awards, shares		274	36
Stock Options
Effect of Dilutive Securities, shares
Stock options, Restricted stock units and restricted stock awards, shares		792	1,594	3,147

[1] Upon the closing of the IPO, all shares of the Company’s then-outstanding convertible Series A Preferred Stock automatically converted into and aggregate of 19,284,113 shares of common stock.