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Derivative Financial Instruments - Summary of Outstanding Forward Foreign Currency Contracts by Currency (Detail) € in Thousands, £ in Thousands, $ in Thousands | Dec. 31, 2017 GBP (£) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 GBP (£) | Sep. 30, 2017 EUR (€) | Sep. 30, 2017 USD ($)
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Foreign Exchange Contracts To Sell European Euro for US Dollar |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  | $ 0 |  |  | $ 0
Foreign Exchange Contracts To Sell European Euro for US Dollar | Foreign currency forward contracts | Short | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Contract amount of forward foreign currency contracts |  | € 7,350 | 8,825 |  | € 5,050 | 5,968
Foreign Exchange Contracts To Purchase British Pounds With US Dollars |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  | 0 |  |  | 0
Foreign Exchange Contracts To Purchase British Pounds With US Dollars | Foreign currency forward contracts | Short | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Contract amount of forward foreign currency contracts | £ 5,398 |  | 7,300 | £ 9,341 |  | $ 12,500
Foreign Exchange Contracts To Purchase Singapore Dollars With US Dollars |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value of forward foreign currency contracts to sell and buy foreign currency |  |  | 0 |  |  |
Foreign Exchange Contracts To Purchase Singapore Dollars With US Dollars | Foreign currency forward contracts | Short | Not Designated as Hedging Instrument |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Contract amount of forward foreign currency contracts | £ 7,734 |  | $ 5,800 |  |  |

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