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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, 2015 | Dec. 31, 2014 | Sep. 30, 2015
Warrant [Member] |  |  |
Options (in shares): |  |  |
Stock options outstanding at September 30, 2015 | 1,800 |  |
Stock options outstanding at December 31, 2015 | 1,800 |  | 1,800
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 | 1,800 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 13.13 |  |
Restricted award expected to vest | $ 3.22 |  |
Employee Stock Option [Member] |  |  |
Options (in shares): |  |  |
Stock options outstanding at September 30, 2015 | 4,770 |  |
Granted | 28 | 822 |
Exercised | (401) |  |
Stock options outstanding at December 31, 2015 | 4,397 |  | 4,770
Stock options vested and exercisable at December 31, 2015 | 3,305 |  |
Weighted Average Exercise Price (in dollars per share): |  |  |
Granted | $ 13.93 |  |
Exercised | 8.07 |  |
Stock options outstanding at December 31, 2015 | 9.39 |  | $ 9.25
Stock options vested and exercisable at December 31, 2015 | 8.43 |  |
Weighted Average Grant Date Fair Value (in dollars per share): |  |  |
Granted | 5.07 |  |
Exercised | 3.12 |  |
Stock options outstanding at December 31, 2015 | 3.77 |  | $ 3.70
Stock options vested and exercisable at December 31, 2015 | $ 3.39 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | 4,397 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | $ 9.39 |  |
Restricted award expected to vest | $ 3.77 |  |

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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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