| **Derivative financial instruments - Additional Information (Detail) - USD ($) $ in Thousands** | 3 Months Ended |
|-------------------------------------------------------------------------------------------------|----------------|
||
| **Derivative Instruments and Hedging Activities Disclosure [Abstract]**                         |           |   |
| Maturity of foreign currency forward contracts                                                  | 90 days        |   |
| Gains (losses) on foreign currency forward contracts                                            | $ 16,139       | $ (3,598) |
| Change in unrealized gain (loss) on foreign currency derivative instruments                     | $ (20,710)     | $ 3,962 |

| X                                                                                                                                                                                                                                                                                                                                                                                                           |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Change In Unrealized Gain (Loss) On Foreign Currency, Derivative Instruments Not Designated as Hedging Instruments
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                   |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Foreign currency forward contracts maturity period maximum.
+ References
No definition available.
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| X                                                                                                                                                                                                                                     |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.
+ References
Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959
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