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Stock-Based Compensation Plans - Summarizes Transactions of SEUs (Detail) - Stock Equivalent Units [Member]
 9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding, Weighted Average Exercise Price, Beginning balance $ 3.10
Granted at discount, Weighted Average Exercise Price 2.36
Granted at market value, Weighted Average Exercise Price 68.20
Exercised, Weighted Average Exercise Price 5.81
Forfeited, Weighted Average Exercise Price 1.40
Outstanding, Weighted Average Exercise Price, Ending balance $ 3.36
Outstanding, Number of SEUs, Beginning balance | shares 400,342
Granted at discount, Number of SEUs | shares 115,229
Granted at market value, Number of SEUs | shares 5,658
Exercised, Number of SEUs | shares (72,689)
Forfeited, Number of SEUs | shares (16,554)
Outstanding, Number of SEUs, Ending balance | shares 431,986
Outstanding, Weighted Average Grant-Date Fair Value $ 46.65
Granted at discount, Weighted Average Grant-Date Fair Value 57.16
Granted at market value, Weighted Average Grant-Date Fair Value 16.23
Exercised, Weighted Average Grant-Date Fair Value 29.27
Forfeited, Weighted Average Grant-Date Fair Value 37.14
Outstanding, Weighted Average Grant-Date Fair Value $ 52.35