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Summary of Calculation of Net Income Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Numerator:    
Net income $ 8,151 $ 18,785
Less: income allocated to unvested restricted shares (323) (239)
Net income attributable to common shareholders - basic 7,828 18,546
Add: undistributed income attributable to unvested restricted shares - basic 0 23
Less: undistributed income attributable to unvested restricted shares - diluted 0 (23)
Net income attributable to common shareholders - diluted $ 7,828 $ 18,546
Denominator:    
Weighted average shares outstanding - basic and diluted (in shares) 59,969 60,013
Net income per share attributable to common shareholders:    
Basic and diluted (in usd per share) $ 0.13 $ 0.31