Herbalife Ltd. Quarterly report pursuant to Section 13 or 15(d)

Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail) - shares	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Forfeited	403,000
Number of Shares, Expected to vest	1,662,000
Market condition awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding SARs	100,000	100,000
Exercisable SARs	100,000
Performance condition SARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding SARs	2,900,000	3,100,000
Forfeited SARs	200,000
Exercisable SARs	1,900,000
Performance condition SARs [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercised SARs	100,000
Performance Based Stock Unit Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Forfeited	357,032
Number of Shares, Expected to vest	355,437
Performance Based Stock Unit Awards [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share based payment awards other than options outstanding and nonvested that can vest maximum	556,504	708,836
Number of share based payment awards other than options that can vest maximum	204,700