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Stock Compensation - Summary of Stock Options Outstanding and Related Activity (Detail) - HGI [Member] - $ / shares shares in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
Warrant [Member] |  |  |
Options (in shares): |  |  |
Stock options outstanding at September 30, 2016 | 1,200 |  |
Stock options outstanding at December 31, 2016 | 1,200 |  | 1,200
Weighted Average Exercise Price (in dollars per share): |  |  |
Granted | $ 13.13 |  | $ 13.13
Weighted Average Grant Date Fair Value (in dollars per share): |  |  |
Granted | $ 3.22 |  | $ 3.22
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 1,200 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 13.13 | $ 13.125 |
Restricted award expected to vest | $ 3.22 |  |
Employee Stock Option [Member] |  |  |
Options (in shares): |  |  |
Stock options outstanding at September 30, 2016 | 4,231 |  |
Granted | 318 | 28 |
Exercised | (77) |  |
Stock options outstanding at December 31, 2016 | 4,472 |  | 4,231
Stock options vested and exercisable at December 31, 2016 | 3,902 |  |
Weighted Average Exercise Price (in dollars per share): |  |  |
Granted | $ 15.39 |  |
Exercised | 12.33 |  |
Stock options outstanding at December 31, 2016 | 9.85 |  | $ 9.48
Stock options vested and exercisable at December 31, 2016 | 9.20 |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |  |
Granted | 5.96 |  |
Exercised | 4.52 |  |
Stock options outstanding at December 31, 2016 | 3.94 |  | $ 3.80
Stock options vested and exercisable at December 31, 2016 | $ 3.71 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 4,472 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 9.85 |  |
Restricted award expected to vest | $ 3.94 |  |

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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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- Definition As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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