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Share-Based Compensation - Additional Information (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | --- | ---
Oct. 03, 2017 | Jul. 06, 2017 | Oct. 31, 2014 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017
Restricted Shares |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Fair value of unvested restricted stock awards |  |  |  | $ 1.6 |  |  |
Performance Options Grants |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Options vested | 414,894 |  |  |  |  |  |
Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock in connection with restricted stock awards, shares |  |  |  | 70,798 |  |  |
Forfeiture of restricted stock awards, shares |  |  |  | 400 |  |  |
Number of options exercised |  |  |  |  | 6,065 |  |
Omnibus Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of common stock reserved and available for issuance |  |  |  |  |  |  | 1,550,000
Number of common shares available for future grants |  |  |  | 1,479,602 |  |  |
Omnibus Plan | Restricted Shares |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Forfeiture of restricted stock awards, shares |  | 400 |  |  |  |  |
Award vesting period |  |  |  | 4 years |  |  |
Restricted shares vested |  |  |  | 0 |  |  |
Restricted shares outstanding |  |  |  | 70,398,000 | 0 |  |
Omnibus Plan | Common Stock |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Issuance of common stock in connection with restricted stock awards, shares |  | 58,900 |  | 11,898 |  |  |
MBG Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  | 0
Number of options exercised |  |  |  |  |  |  | 0
BYB Plan |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of common shares available for future grants |  |  |  | 0 |  |  |
Number of options granted |  |  |  | 0 | 212,400 | 1,634,568 |
Number of options exercised |  |  |  | 0 |  |  |
Number of shares outstanding |  |  |  | 1,783,020 | 1,798,220 |  | 1,783,020
Award contractual term |  |  |  | 7 years 7 months 6 days | 8 years 7 months 6 days |  |
BYB Plan | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of common stock reserved and available for issuance |  |  | 2,476,122 |  |  |  |
Number of common shares available for future grants |  |  | 2,476,122 |  |  |  |
BYB Plan | Time Options Grants |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Award contractual term |  |  | 10 years |  |  |  |
BYB Plan | Time Options Grants | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |  |
BYB Plan | Time Options Grants | Minimum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 1 year |  |  |  |
BYB Plan | Performance Options Grants |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Award contractual term |  |  | 10 years |  |  |  |
BYB Plan | Performance Options Grants | Maximum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 5 years |  |  |  |
BYB Plan | Performance Options Grants | Minimum |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  | 1 year |  |  |  |

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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=96867065&loc=d3e5070-113901 + Details
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