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Summary of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Earning per share reconciliation        
Net income $ 6,325 $ 1,882 $ 15,364 $ 13,151
Weighted-average common shares outstanding 76,534 76,351 76,521 76,312
Earnings per share, basic $ 0.08 $ 0.02 $ 0.20 $ 0.17
Net income $ 6,325 $ 1,882 $ 15,364 $ 13,151
Weighted-average common shares outstanding, basic 76,534 76,351 76,521 76,312
Effect of assumed exercise of stock options and RSUs 2,640 2,302 2,385 2,219
Weighted-average common shares outstanding, diluted 79,174 78,653 78,906 78,531
Earnings per share, diluted $ 0.08 $ 0.02 $ 0.19 $ 0.17
Outstanding options and RSUs excluded as impact would be anti-dilutive 320 107 201 110
Stock Options        
Earning per share reconciliation        
Weighted-average effect of dilutive securities 1,603 1,730 1,546 1,754
RSUs        
Earning per share reconciliation        
Weighted-average effect of dilutive securities 1,037 572 839 465