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Equity Compensation Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Feb. 06, 2019 | May 23, 2018 | Mar. 07, 2018 | May 31, 2016 | Jun. 30, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock, shares authorized |  |  |  | 4,300,000 | 300,000,000 | 300,000,000
Expiration date of Incentive Plan |  |  |  |  | May 12, 2026 |
Restricted Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period | 3 years |  | 4 years |  |  |
Weighted average fair value, granted |  |  | $ 10.23 |  |  |
Grant date fair value |  |  | $ 900 |  |  |
Restricted Stock | Non Executive Officer Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued | 92,925 |  |  |  |  |
Weighted average fair value, granted | $ 10.35 |  |  |  |  |
Grant date fair value | $ 962 |  |  |  |  |
Restricted Stock | Executive Officers |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued |  |  | 87,975 |  |  |
Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period |  |  | 3 years |  |  |
Shares issued |  |  | 263,929 |  |  |
Grant date fair value |  |  | $ 2,203 |  |  |
Maximum | Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation arrangement by share based payment award number share issuable percentage |  |  | 150.00% |  |  |
Minimum | Performance Share Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share based compensation arrangement by share based payment award number share issuable percentage |  |  | 0.00% |  |  |
Long Term Incentive Plan | Non-employee Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares issued |  | 32,844 |  |  |  |
Grant date fair value |  | $ 360 |  |  |  |
Weighted average fair value, granted |  | $ 10.96 |  |  |  |
Long Term Incentive Plan | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period |  |  |  | 3 years |  |
Long Term Incentive Plan | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Awards vesting period |  |  |  | 4 years |  |

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- Definition Share based compensation arrangement by share based payment award number share issuable percentage. + References No definition available. + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Date the equity-based award expires, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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