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Share Based Compensation - Summary of Changes in Non-Vested Units Outstanding (Details)
 6 Months Ended
Jun. 30, 2019
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Non-vested units, Beginning Balance | shares 9,460
Vested, Units | shares (289)
Non-vested units, Ending Balance | shares 9,171
Weighted average fair value per unit, Beginning Balance | $ / shares $ 182.83
Weighted average fair value per unit, Vested | $ / shares (245.02)
Weighted average fair value per unit, Ending Balance | $ / shares $ 180.87