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Earnings Per Share - Computation of Basic and Diluted Net Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:                      
Net income                 $ 66,807 $ 43,840 $ 20,945
Less: income allocable to participating securities                 (171) (333) (270)
Income allocable to common shares                 66,636 43,507 20,675
Add back: undistributed earnings allocable to participating securities                 171 333 270
Less: undistributed earnings reallocated to participating securities                 (168) (333) (264)
Numerator for diluted earnings per share                 $ 66,639 $ 43,507 $ 20,681
Denominator:                      
Weighted average common shares outstanding                 50,315,455 50,315,455 50,315,455
Weighted average common shares repurchased                 (1,526,930) (286,699)  
Adjustment for vested restricted stock                 9,050,630 7,521,448 6,179,715
Shares for calculating basic earnings per share 58,100,141 58,003,222 57,898,914 57,307,187 57,652,531 57,819,734 57,591,556 57,132,909 57,839,155 57,550,204 56,495,170
Dilutive effect of unvested restricted stock                 950,864 1,417,895 1,424,530
Shares for calculating diluted earnings per share 58,850,271 58,873,502 58,816,442 58,525,980 58,882,966 58,907,281 58,697,229 58,362,040 58,790,019 58,968,099 57,919,700
Earnings per share:                      
Basic $ 0.22 $ 0.24 $ 0.24 $ 0.44 $ 0.15 $ 0.11 $ 0.18 $ 0.32 $ 1.15 $ 0.76 $ 0.37
Diluted $ 0.22 $ 0.24 $ 0.24 $ 0.43 $ 0.15 $ 0.10 $ 0.18 $ 0.31 $ 1.13 $ 0.74 $ 0.36