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Stock-based Compensation - Compensation Expense Associated with Performance Units (Detail) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense | $ 750,000 |  |
Performance Shares [Member] | Year Twenty Twenty One [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense | 1,806,000 |  |
Performance Shares [Member] | Year Twenty Twenty [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense | 275,000 | $ 206,000 |
Performance Shares [Member] | Year Twenty Nineteen [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense | 3,319,000 | 3,319,000 | $ 2,489,000
Performance Shares [Member] | Year Twenty Eighteen [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense | $ 667,000 | 2,668,000 | 2,668,000
Performance Shares [Member] | Year Twenty Seventeen [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense |  | $ 642,000 | 1,927,000
Performance Shares [Member] | Year Twenty Sixteen [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense |  |  | $ 321,000

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