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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Restricted Stock Unit [Abstract] |  |  |  |
Number of units at threshold IRR |  | 58,545 | 84,554 | 47,640
Number of units at target IRR |  | 117,089 | 169,107 | 95,282
Number of units at maximum IRR |  | 175,634 | 253,661 | 142,917
Fair value of units at threshold IRR | [1] | $ 2,481 | $ 2,522 | $ 2,057
Fair value of units at target IRR | [1] | 4,961 | 5,044 | 4,115
Fair value of units at maximum IRR | [1] | $ 7,442 | $ 7,568 | $ 6,173
[1] | The grant date fair values for units issued during the years ended December 31, 2015, 2016, and 2017 were $43.19, $29.83 and $42.37, respectively.

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