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Trading assets and liabilities (Detail 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Derivative, Notional Amount | $ 204,420 | $ 102,302
Asset, Fair Value | 119 | 21
Liability, Fair Value | 32,304 | 5,584
Interest Rate Swap [Member] |  |
Derivative, Notional Amount | 35,291 | 17,000
Asset, Fair Value | 0 | 0
Liability, Fair Value | 100 | 748
Cross Currency Interest Rate Swap [Member] |  |
Derivative, Notional Amount | 155,081 | 85,163
Asset, Fair Value | 49 | 21
Liability, Fair Value | 32,182 | 4,836
Future [Member] |  |
Derivative, Notional Amount | 6,896 | 139
Asset, Fair Value | 20 | 0
Liability, Fair Value | 0 | 0
Forward Foreign Exchange [Member] |  |
Derivative, Notional Amount | 7,152 | 0
Asset, Fair Value | 50 | 0
Liability, Fair Value | $ 22 | $ 0

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