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Summary of Potential Number of Shares Vesting under Restricted Stock Unit Awards (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Schedule of Restricted Stock Unit [Line Items] |  |  |  |
Number of units at IRR level of at least 8.5% |  | 47,640 | 65,832 | 38,366
Number of units at IRR level of at least 10.5% |  | 95,282 | 131,683 | 76,741
Number of units at IRR level of at least 12.5% |  | 142,917 | 197,515 | 115,107
Fair value of units at IRR level of at least 8.5% | [1] | $ 2,057 | $ 1,879 | $ 1,129
Fair value of units at IRR level of at least 10.5% | [1] | 4,115 | 3,758 | 2,259
Fair value of units at IRR level of at least 12.5% | [1] | $ 6,173 | $ 5,637 | $ 3,389
At IRR of at least 7.5% |  | 47,640 | 65,832 | 38,366
At IRR of at least 9.5% |  | 95,282 | 131,683 | 76,741
At IRR of at least 11.5% |  | 142,917 | 197,515 | 115,107
IRR of at least 7.5% | [1] | $ 2,057 | $ 1,879 | $ 1,129
IRR of at least 9.5% | [1] | 4,115 | 3,758 | 2,259
IRR of at least 11.5% | [1] | $ 6,173 | $ 5,637 | $ 3,389
[1] | The weighted average grant date fair values for units issued during the years ended December 31, 2013, 2014, and 2015 were $29.44, $28.54 and $43.19, respectively.

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- Definition Number Of Shares Vesting At Irr Target Level Of At Least Eleven Point Five Percent + References No definition available. + Details
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