Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Line Items]
Net income attributable to common stockholders	$ 13,182	$ 6,867	$ 35,920	$ 26,789
Basic EPS, Shares
Weighted average number of shares outstanding, basic	85,217	84,583	84,889	83,827
Diluted EPS, shares
Weighted average number of shares outstanding, diluted	86,424	85,867	85,957	85,599
Basic EPS, per share amount
Net income attributable to common stockholders, per share amount	$ 0.15	$ 0.08	$ 0.42	$ 0.32
Diluted EPS, per share amount
Net income attributable to common stockholders plus assumed conversions, per share amount	$ 0.15	$ 0.08	$ 0.42	$ 0.31
Stock Options
Effect of Dilutive Securities, shares
Stock options, Restricted stock units and restricted stock awards, shares	776	1,267	837	1,761
Restricted Stock Units and Restricted Stock Awards
Effect of Dilutive Securities, shares
Stock options, Restricted stock units and restricted stock awards, shares	431	17	231	11