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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share [Abstract]    
Net income available to common shareholders $ 15,255 $ 12,312
Less: earnings allocated to participating securities 141 121
Net income allocated to common shareholders $ 15,114 $ 12,191
Weighted average number of common shares outstanding - basic (in shares) 47,503 47,354
Share-based plans (in shares) 233 269
Weighted average number of common shares outstanding - diluted (in shares) 47,736 47,623
Basic earnings per share (in usd per share) $ 0.32 $ 0.26
Diluted earnings per share (in usd per share) $ 0.32 $ 0.26