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Fair Value of Performance Units (Detail) - Performance Units Awards $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($)
2020 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | $ 826
2019 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 9,958
2018 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 8,004
2017 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 5,780
2016 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 3,854
2015 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | $ 4,052

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- Definition Share based compensation arrangement by share based payment award grant date fair value of awards. + References No definition available. + Details
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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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