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)

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Derivative Instruments and Hedging Activities - Gains (Losses) Relating to Derivative Instruments Recorded to Income (Parenthetical) (Detail) (Derivatives designated as hedging instruments [Member], USD $)
6 Months Ended
Jun. 30, 2014
Derivatives designated as hedging instruments [Member]
 
Derivative Instruments, Gain (Loss) [Line Items]  
Ineffective amounts recorded for derivatives designated as hedging instruments $ 0