Quarterly report pursuant to Section 13 or 15(d)

Share Repurchase Program - Summary of Stock Repurchase Activities (Detail)

v3.10.0.1
Share Repurchase Program - Summary of Stock Repurchase Activities (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Share Repurchase Program [Abstract]    
Shares repurchased 1,406,591 1,993,163
Average cost per share $ 28.46 $ 29.11
Total cost of shares repurchased (in thousands): $ 40,028 $ 58,027