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Stock-based Compensation - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of stock option granted |  | 0 | 0
Performance Units Awards |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Performance period |  | 3 years |
Performance Units Awards | 2016 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares issued | 332,773 |  |
Performance Units Awards | Condition One [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award description |  | For the Performance Units granted in April 2018, the recipients will receive a target number of shares if our total shareholder return during the performance period, when compared to the peer group, is at the 50th percentile. For the Performance Units granted in April 2019 and April 2020, the recipients will receive the target number of shares if our total shareholder return during the performance period, when compared to the peer group, is at the 55th percentile. If our total shareholder return during the performance period, when compared to the peer group, is at the 75th percentile or higher, then the recipients will receive two times the target number of shares. If our total shareholder return during the performance period, when compared to the peer group, is at the 25th percentile, then the recipients will only receive one-half of the target number of shares. If our total shareholder return during the performance period, when compared to the peer group, is between the 25th and target percentile, or the target and 75th percentile, then the shares to be received by the recipients will be determined using linear interpolation for levels of achievement between these points. For the Performance Units granted in April 2018, the payout is based on relative performance and does not have an absolute performance requirement. For the Performance Units granted in April 2019 and April 2020, the payout shall not exceed the target number of shares if our total shareholder return is negative or zero. Additionally, the Performance Units granted in April 2020 will not pay out if our total shareholder return is not equal to or greater than the total stockholder return of the S&P 500 Index for the Performance Period. |
Phantom Share Units (PSUs) |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award description | Mr. Hendricks may earn from 0% to 200% of a target award of 298,500 phantom units based on our achievement of the same performance conditions over the same Performance Period that applies to the Performance Units granted in April 2020, as described above. Earned Phantom Units, if any, will be settled in 2023, following completion of the three-year Performance Period, in a cash payment equal to the number of earned phantom units multiplied by our average trading price per share over the twenty consecutive trading days ending March 31, 2023. |  |
Performance completion year | 2023 |  |
Performance Period | 3 years |  |
Grant date fair value | $ 1.2 |  |
Expense recognized |  | $ 0.2 |
Phantom Share Units (PSUs) | Chief Executive Officer and President |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Number of units awardable based on performance conditions | 298,500 |  |
Phantom Share Units (PSUs) | Chief Executive Officer and President | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Percentage of target award vesting rights | 0.00% |  |
Phantom Share Units (PSUs) | Chief Executive Officer and President | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Percentage of target award vesting rights | 200.00% |  |

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