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Notes Payable - Additional Information (Detail) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |
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Dec. 31, 2013 Unsecured Senior Notes Due Two Thousand Seventeen | Nov. 28, 2012 Unsecured Senior Notes Due Two Thousand Seventeen USD ($) | Dec. 31, 2013 Unsecured Senior Notes Due Two Thousand Twenty Two | Nov. 28, 2012 Unsecured Senior Notes Due Two Thousand Twenty Two USD ($) | Dec. 31, 2013 Unsecured Senior Notes Due Twenty Eighteen | Nov. 28, 2012 Unsecured Senior Notes Due Twenty Eighteen USD ($) | Dec. 31, 2013 Unsecured Senior Notes USD ($) | Dec. 31, 2013 Unsecured Senior Notes CNY | Dec. 31, 2012 Unsecured Senior Notes CNY | Nov. 28, 2012 Unsecured Senior Notes Tranche
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Number of tranches issued and sold |  |  |  |  |  |  |  |  |  | 2
Debt face amount |  | $ 750,000,000 |  | $ 750,000,000 |  | $ 1,000,000,000 |  |  |  |
Debt, maturity date | Nov. 28, 2017 |  | Nov. 28, 2022 |  | Aug. 06, 2018 |  |  |  |  |
Interest rate | 2.25% |  | 3.50% |  | 3.25% |  |  |  |  |
Net proceeds from issuance of debt |  |  |  |  |  |  | 1,000,000,000 | 6,070,000,000 | 9,300,000,000 |
Discount on debt issued |  |  |  |  |  |  | 3,380,000 | 20,470,000 |  |
Debt issuance cost |  |  |  |  |  |  | $ 13,190,000 | 79,850,000 |  |
Effective interest rate | 2.36% |  | 3.59% |  | 3.39% |  |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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