Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Recorded to Income (Parenthetical) (Detail)

v2.4.1.9
Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Recorded to Income (Parenthetical) (Detail) (Derivatives designated as hedging instruments [Member], USD $)
12 Months Ended
Dec. 31, 2014
Derivatives designated as hedging instruments [Member]
 
Derivative Instruments, Gain (Loss) [Line Items]  
Ineffective amounts recorded for derivatives designated as hedging instruments $ 0hlf_IneffectiveAmountsRecordedForDerivativesDesignatedAsHedgingInstruments
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember