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Shareholders' Equity - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 shares | Jun. 26, 2019 USD ($) Employee shares | Feb. 12, 2018 $ / shares | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) Incentive_Plan $ / shares shares | Sep. 30, 2018 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Dividend declared date |  |  |  |  |  |  |  | Feb. 12, 2018 |
Special cash dividend | $ / shares |  |  | $ 1.00 |  |  |  |  |  |
Dividend payable date |  |  |  |  |  |  |  | Apr. 03, 2018 |
Dividend record date |  |  |  |  |  |  |  | Mar. 06, 2018 |
Number of incentive plans | Incentive_Plan |  |  |  |  |  |  |  | 2 |
Stock based compensation expense |  |  |  |  | $ 569 |  | $ 459 | $ 3,643 | $ 1,306
Payments related to employees' tax obligations to taxing authorities for stock awards |  |  |  |  |  |  |  | $ 600 |
Employer tax and expenses for stock awards |  |  |  | $ 200 |  |  |  |  |
Chief Executive Officer, Robert A. Frist, Jr., [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares contributed to the company | shares |  | 78,520 |  |  |  |  |  |  |
Value of shares contributed to the company |  | $ 2,000 |  |  |  |  |  |  |
Number of additional shares contributed to the company | shares | 7,852 |  |  |  |  |  |  |  |
RSUs [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Restricted share units issued | shares |  |  |  |  |  |  |  | 96,828 | 83,168
Weighted average grant date fair value, restricted share unit | $ / shares |  |  |  |  |  |  |  | $ 27.31 | $ 24.70
2016 Omnibus Incentive Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares vested | shares |  | 78,520 |  |  |  |  |  |  |
Number of employees awarded fully vested shares | Employee |  | 820 |  |  |  |  |  |  |
Stock based compensation expense |  |  |  |  |  | $ 2,000 |  |  |

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