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Summary of Potential Number of Units that Could Vest Under Restricted Stock Unit Awards (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Restricted Stock Unit [Abstract] |  |  |  |
Number of units at threshold IRR |  | 136,285 | 76,065 | 58,545
Number of units at target IRR |  | 204,427 | 152,129 | 117,089
Number of units at maximum IRR |  | 306,651 | 228,194 | 175,634
Fair value of units at threshold IRR | [1] | $ 5,011 | $ 2,967 | $ 2,481
Fair value of units at target IRR | [1] | 7,517 | 5,938 | 4,961
Fair value of units at maximum IRR | [1] | $ 11,276 | $ 8,906 | $ 7,442
[1] | The grant date fair value for units issued during the year ended December 31, 2017 was $42.37. The grant date fair values for the units issued during the year ended December 31, 2018 ranged from $37.55 to $39.03. The grant date fair value for units issued during the year ended December 31, 2019

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