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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 | Jun. 30, 2013 | Dec. 31, 2012
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Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | $ 3,646,978 | $ 1,525,881
Gross Amounts Offset in the Statement of Financial Position | 3,455,764 | 1,160,239
Net Amounts of Assets Presented on the Balance Sheet | 191,214 | 365,642
Financial Instruments | (191,214) | (365,642)
Cash Collateral Received |  |
Net Amount |  |
Gross Amounts of Recognized Liabilities | 4,186,666 | 1,743,017
Gross Amounts Offset in the Statement of Financial Position | 3,455,764 | 1,160,239
Net Amounts of Liabilities Presented on the Balance Sheet | 730,902 | 582,778
Financial Instruments | (730,902) | (582,778)
Cash Collateral Pledged |  |
Net Amount |  |
Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 3,951,786 | 1,552,630
Gross Amounts Offset in the Statement of Financial Position | 3,455,764 | 1,160,239
Net Amounts of Liabilities Presented on the Balance Sheet | 496,022 | 392,391
Financial Instruments | (496,022) | (392,391)
Cash Collateral Pledged |  |
Net Amount |  |
Securities Lending [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Liabilities | 234,880 | 190,387
Net Amounts of Liabilities Presented on the Balance Sheet | 234,880 | 190,387
Financial Instruments | (234,880) | (190,387)
Cash Collateral Pledged |  |
Net Amount |  |
Reverse Repurchase Agreements [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 3,455,764 | 1,160,239
Gross Amounts Offset in the Statement of Financial Position | 3,455,764 | 1,160,239
Cash Collateral Received |  |
Net Amount |  |
Securities Borrowing [Member] |  |
Securities Financing Transaction [Line Items] |  |
Gross Amounts of Recognized Assets | 191,214 | 365,642
Net Amounts of Assets Presented on the Balance Sheet | 191,214 | 365,642
Financial Instruments | (191,214) | (365,642)
Cash Collateral Received |  |
Net Amount |  |

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