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Compensation Expense Associated with Performance Units (Detail) - Performance Units Awards - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
2020 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense associated with Performance Units | $ 206 |  |
2019 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense associated with Performance Units | 3,319 | $ 2,489 |
2018 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense associated with Performance Units | 2,668 | 2,668 | $ 2,001
2017 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense associated with Performance Units | $ 642 | 1,927 | 1,927
2016 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense associated with Performance Units |  | $ 321 | 1,285
2015 |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock-based compensation expense associated with Performance Units |  |  | $ 338

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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