Quarterly report pursuant to Section 13 or 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 $)
3 Months Ended
Mar. 31, 2015
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