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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
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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

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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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