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Stock-based Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) - Employee Stock Option - HGI
shares in Thousands
 3 Months Ended
Dec. 31, 2017
$ / shares
shares
Options (in shares):  
Stock options outstanding at September 30, 2017 | shares 3,976
Granted | shares 0
Exercised | shares (113)
Stock options outstanding at December 31, 2017 | shares 3,863
Stock options vested and exercisable at December 31, 2017 | shares 3,606
Stock options outstanding and expected to vest | shares 3,863
Weighted Average Exercise Price (in dollars per share):  
Stock options outstanding at September 30, 2017 $ 9.69
Exercised 12.25
Stock options outstanding at December 31, 2017 9.61
Stock options vested and exercisable at December 31, 2017 9.20
Stock options outstanding and expected to vest 9.61
Weighted Average Grant Date Fair Value (in dollars per share):  
Stock options outstanding at September 30, 2017 3.88
Granted 0.00
Exercised 4.82
Stock options outstanding at December 31, 2017 3.85
Stock options vested and exercisable at December 31, 2017 3.70
Stock options outstanding and expected to vest $ 3.85