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Incentive Plan - Summary of Long-Term Incentive Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Units      
Granted (shares) 128,049 120,368 128,986
Long-term incentive units      
Units      
Unvested beginning of period (shares) 208,287    
Granted (shares) 128,049    
Vested (shares) (98,038)    
Cancelled or expired (shares) (2,763)    
Unvested end of period (shares) 235,535 208,287  
Weighted-Average Grant Date Fair Value      
Unvested, beginning of period (in dollars per share) $ 110.00    
Granted (in dollars per share) 134.55 $ 116.22 $ 101.86
Vested (in dollars per share) 98.22    
Cancelled or expired (in dollars per share) 112.82    
Unvested, end of period (in dollars per share) $ 122.22 $ 110.00  
Weighted-Average Remaining Contractual Life (Years) 2 years 1 month 2 days    
Aggregate Intrinsic Value $ 32,859    
Intrinsic value of units $ 11,600 $ 5,700 $ 4,200
Units outstanding and exercisable 900,000    
Intrinsic value of units outstanding and exercisable $ 122,000    
Long-term incentive units | Minimum      
Weighted-Average Grant Date Fair Value      
Award vesting period 2 years    
Long-term incentive units | Maximum      
Weighted-Average Grant Date Fair Value      
Award vesting period 4 years    
Market performance-based awards      
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 159.34 $ 114.97 $ 119.29
Market performance-based awards | Minimum      
Weighted-Average Grant Date Fair Value      
Award vesting period 2 years    
Market performance-based awards | Maximum      
Weighted-Average Grant Date Fair Value      
Award vesting period 3 years    
Restricted stock      
Units      
Unvested beginning of period (shares) 372,792    
Vested (shares) (385,905)    
Cancelled or expired (shares) (35,274)    
Unvested end of period (shares) 783,219 372,792  
Weighted-Average Grant Date Fair Value      
Unvested, beginning of period (in dollars per share) $ 108.47    
Granted (in dollars per share) 138.82 $ 115.25 $ 100.33
Vested (in dollars per share) 116.19    
Cancelled or expired (in dollars per share) 120.31    
Unvested, end of period (in dollars per share) $ 123.04 $ 108.47  
Weighted-Average Remaining Contractual Life (Years) 2 years 3 months 10 days    
Aggregate Intrinsic Value $ 108,797    
Award vesting period 4 years    
Intrinsic value of units $ 53,400 $ 14,000 $ 10,000
Interxion awards      
Units      
Granted (shares) 567,810    
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 120.67