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Financial Instruments and Fair Value Measurements - Schedule of Fair Value of Derivative Instruments (Parenthetical) (Detail) (Foreign Currency Options [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Foreign Currency Options [Member]
  
Derivatives, Fair Value [Line Items]  
Gains on foreign exchange transactions $ 20.1pld_GainsLossesOnInvestmentAndForeignExchange
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeOptionMember