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Notes Payable - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 Unsecured Senior Notes USD ($) | Dec. 31, 2012 Unsecured Senior Notes CNY | Nov. 28, 2012 Unsecured Senior Notes USD ($) Tranche | Nov. 28, 2012 Unsecured Senior Notes CNY | Dec. 31, 2012 Senior Unsecured Notes Due TwoThousand Seventeen | Nov. 28, 2012 Senior Unsecured Notes Due TwoThousand Seventeen USD ($) | Dec. 31, 2012 Senior Unsecured Notes Due Two Thousand Twenty Two | Nov. 28, 2012 Senior Unsecured Notes Due Two Thousand Twenty Two USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of tranches issued and sold |  |  | 2 | 2 |  |  |  |
Debt face amount |  |  |  |  |  | $ 750,000,000 |  | $ 750,000,000
Debt, maturity date |  |  |  |  | Nov. 28, 2017 |  | Nov. 28, 2022 |
Interest rate |  |  |  |  | 2.25% |  | 3.50% |
Net proceeds from issuance of debt | 1,490,000,000 | 9,300,000,000 |  |  |  |  |  |
Discount on debt issued |  |  | 1,670,000 | 10,370,000 |  |  |  |
Debt issuance cost | $ 8,060,000 | 50,190,000 |  |  |  |  |  |
Effective interest rate |  |  |  |  | 2.36% |  | 3.59% |

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