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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Restricted Stock Unit [Abstract] |  |  |  |
Number of units at threshold IRR |  | 76,065 | 58,545 | 84,554
Number of units at target IRR |  | 152,129 | 117,089 | 169,107
Number of units at maximum IRR |  | 228,194 | 175,634 | 253,661
Fair value of units at threshold IRR | [1] | $ 2,967 | $ 2,481 | $ 2,522
Fair value of units at target IRR | [1] | 5,938 | 4,961 | 5,044
Fair value of units at maximum IRR | [1] | $ 8,906 | $ 7,442 | $ 7,568
[1] | The grant date fair values for units issued during the years ended December 31, 2016 and 2017 were $29.83 and $42.37, respectively. The grant date fair values for the units issued during the year ended December 31, 2018 ranged from $37.55 to $39.03.

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