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Equity-Based Compensation, Profit Sharing and Deferred Compensation Plans - Equity-Based Compensation Plans (Detail)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Stock Options  
Stock Option, Shares  
Outstanding at beginning of period (Shares) 916
Granted (Shares) 345
Exercised (Shares) (182)
Forfeited (Shares) (30)
Outstanding at end of period (Shares) 1,049
Exercisable at end of period (Shares) 466
Weighted Average Per Share Exercise Price  
Outstanding at beginning of period (Weighted Average Exercise Price) | $ / shares $ 1,119.92
Granted (Weighted Average Exercise Price) | $ / shares 3,013.61
Exercised (Weighted Average Exercise Price) | $ / shares 954.49
Forfeited (Weighted Average Exercise Price) | $ / shares 1,283.48
Outstanding at end of period (Weighted Average Exercise Price) | $ / shares 1,766.87
Exercisable at end of period (Weighted Average Exercise Price) | $ / shares $ 1,032.44
Remaining Contractual Life and Aggregate Intrinsic Value  
Outstanding at end of period (Weighted Average Remaining Contract Life (Years) 6 years 6 months
Exercisable at end of period (Weighted Average Remaining Contract Life (Years) 4 years 7 months
Outstanding at end of period (Aggregate Intrinsic Value) | $ $ 703,087
Exercisable at end of period (Aggregate Intrinsic Value) | $ $ 655,141
Employee Performance Based Stock Option [Member]  
Stock Option, Shares  
Granted (Shares) 173
2010 Plan  
Stock Option, Shares  
Granted (Shares) 6
RSU, Shares  
Granted (Shares) 16
2010 Plan | Stock Options  
Stock Option, Shares  
Granted (Shares) 6
Outstanding at end of period (Shares) 139
2010 Plan | RSUs  
RSU, Shares  
Outstanding at beginning of period (Shares) 10
Granted (Shares) 16
Vested (Shares) (5)
Forfeited (Shares) 0
Outstanding at end of period (Shares) 21
Vested, but not issued at end of period (Shares) 5
Remaining Contractual Life and Aggregate Intrinsic Value  
Outstanding at end of period (Aggregate Intrinsic Value) | $ $ 50,719
Vested, but not issued at end of period (Aggregate Intrinsic Value) | $ $ 11,532
2010 Plan | Employee Performance Based Stock Option [Member]  
Stock Option, Shares  
Granted (Shares) 0
2010 Plan | Time Based Restricted Stock Unit [Member]  
RSU, Shares  
Granted (Shares) 8
2010 Plan | Performance Based Restricted Stock Unit [Member]  
RSU, Shares  
Granted (Shares) 8
2014 Plan  
Stock Option, Shares  
Granted (Shares) 193
RSU, Shares  
Granted (Shares) 0
2014 Plan | Stock Options  
Stock Option, Shares  
Granted (Shares) 93
2014 Plan | RSUs  
RSU, Shares  
Granted (Shares) 0
2014 Plan | Employee Performance Based Stock Option [Member]  
Stock Option, Shares  
Granted (Shares) 100
2014 Plan | Performance Based Restricted Stock Unit [Member]  
RSU, Shares  
Granted (Shares) 0
2018 Plan  
Stock Option, Shares  
Granted (Shares) 146
RSU, Shares  
Granted (Shares) 0
2018 Plan | Stock Options  
Stock Option, Shares  
Granted (Shares) 73
2018 Plan | RSUs  
RSU, Shares  
Granted (Shares) 0
2018 Plan | Employee Performance Based Stock Option [Member]  
Stock Option, Shares  
Granted (Shares) 73
2018 Plan | Performance Based Restricted Stock Unit [Member]  
RSU, Shares  
Granted (Shares) 0