Quarterly report pursuant to Section 13 or 15(d)

Earnings per Share - Summary of Weighted Average Number of Basic Common Shares Outstanding and the Calculation of Basic Earnings Per Share (Detail)

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Earnings per Share - Summary of Weighted Average Number of Basic Common Shares Outstanding and the Calculation of Basic Earnings Per Share (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Numerator        
Net income attributable to common stockholders $ 11,248 $ 2,800 $ 22,244 $ 7,361
Denominator        
Weighted average number of basic common shares outstanding 41,717,024 41,502,490 41,704,071 41,502,490
Net income per basic common share attributable to common stockholders $ 0.27 $ 0.07 $ 0.53 $ 0.18