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Fair Value of Performance Units (Detail) - Performance Units Awards $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($)
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
2014 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | 5,388
2013 |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Aggregate fair value at date of grant | $ 5,564

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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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