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Equity-Based Compensation - Summary of stock option activity (Detail) - PICU
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Nonvested units, beginning balance (Shares) 959
Shares granted (shares) 332
Share Vested (Shares) 780
Shares forfeited (shares) 30
Nonvested units,ending balance (Shares) 481
Nonvested units,beginning balance 22.07
Granted | $ / shares $ 442.30
Vested | $ / shares 169.55
Forfeited | $ / shares $ 442.30
Nonvested units, ending balance 22.07