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Financial instruments - Schedule of Gross Amounts and Offsetting Amounts of Reverse Repurchase Agreements, Repurchase Agreements, Securities Borrowed and Securities Lending Transactions (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | $ 4,049,058 | $ 1,525,881
Gross Amounts Offset in the Statement of Financial Position | 3,862,697 | 1,160,239
Net Amounts of Assets Presented on the Balance Sheet | 186,361 | 365,642
Financial Instruments | (186,361) | (365,642)
Cash Collateral Received |  |
Net Amount |  |
Gross Amounts of Recognized Liabilities | 4,582,434 | 1,743,017
Gross Amounts Offset in the Statement of Financial Position | 3,862,697 | 1,160,239
Net Amounts of Liabilities Presented on the Balance Sheet | 719,737 | 582,778
Financial Instruments | (719,737) | (582,778)
Cash Collateral Pledged |  |
Net Amount |  |
Repurchase agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 4,406,833 | 1,552,630
Gross Amounts Offset in the Statement of Financial Position | 3,862,697 | 1,160,239
Net Amounts of Liabilities Presented on the Balance Sheet | 544,136 | 392,391
Financial Instruments | (544,136) | (392,391)
Cash Collateral Pledged |  |
Net Amount |  |
Securities lending [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 175,601 | 190,387
Net Amounts of Liabilities Presented on the Balance Sheet | 175,601 | 190,387
Financial Instruments | (175,601) | (190,387)
Cash Collateral Pledged |  |
Net Amount |  |
Reverse repurchase agreement [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 3,862,697 | 1,160,239
Gross Amounts Offset in the Statement of Financial Position | 3,862,697 | 1,160,239
Cash Collateral Received |  |
Net Amount |  |
Securities borrowing [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 186,361 | 365,642
Net Amounts of Assets Presented on the Balance Sheet | 186,361 | 365,642
Financial Instruments | (186,361) | (365,642)
Cash Collateral Received |  |
Net Amount |  |

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