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Summary of Outstanding Forward Foreign Currency Contracts by Currency (Detail) In Thousands, unless otherwise specified | Dec. 31, 2013 Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar USD ($) | Sep. 30, 2013 Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar USD ($) | Dec. 31, 2013 Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument USD ($) | Dec. 31, 2013 Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument CAD | Sep. 30, 2013 Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument USD ($) | Sep. 30, 2013 Foreign Exchange Contracts to Sell Canadian Dollar for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument CAD | Dec. 31, 2013 Foreign Exchange Contracts To Sell European Euro for US Dollar USD ($) | Sep. 30, 2013 Foreign Exchange Contracts To Sell European Euro for US Dollar USD ($) | Dec. 31, 2013 Foreign Exchange Contracts To Sell European Euro for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument USD ($) | Dec. 31, 2013 Foreign Exchange Contracts To Sell European Euro for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument EUR (€) | Sep. 30, 2013 Foreign Exchange Contracts To Sell European Euro for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument USD ($) | Sep. 30, 2013 Foreign Exchange Contracts To Sell European Euro for US Dollar Foreign currency forward contracts Short Not Designated as Hedging Instrument EUR (€) | Dec. 31, 2013 Foreign Exchange Contracts To Purchase British Pounds With US Dollars USD ($) | Sep. 30, 2013 Foreign Exchange Contracts To Purchase British Pounds With US Dollars USD ($) | Dec. 31, 2013 Foreign Exchange Contracts To Purchase British Pounds With US Dollars Foreign currency forward contracts Short Not Designated as Hedging Instrument USD ($) | Dec. 31, 2013 Foreign Exchange Contracts To Purchase British Pounds With US Dollars Foreign currency forward contracts Short Not Designated as Hedging Instrument GBP (£) | Sep. 30, 2013 Foreign Exchange Contracts To Purchase British Pounds With US Dollars Foreign currency forward contracts Short Not Designated as Hedging Instrument USD ($) | Sep. 30, 2013 Foreign Exchange Contracts To Purchase British Pounds With US Dollars Foreign currency forward contracts Short Not Designated as Hedging Instrument GBP (£)
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Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  |  | $ 4,398 | 4,700 | $ 4,542 | 4,700 |  |  | $ 7,818 | € 5,700 | $ 7,307 | € 5,400 |  |  | $ 6,000 | £ 3,633 | $ 10,500 | £ 6,513
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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