Fair Value of Financial Instruments - Additional Information (Detail) - Distributor	9 Months Ended	12 Months Ended
	Oct. 07, 2017	Dec. 31, 2016
Fair Value Disclosures [Line Items]
Number of independent distributors	3,870
Percentage of down payment on distribution rights purchased	5.00%
2026 Notes
Fair Value Disclosures [Line Items]
Derivative, fixed interest rate	3.50%
Senior notes due year	2026	2026
2022 Notes
Fair Value Disclosures [Line Items]
Derivative, fixed interest rate	4.375%
Senior notes due year	2022	2022
Maximum
Fair Value Disclosures [Line Items]
Financing period of distribution rights, years	10 years