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v3.3.1.900

Notes Payable - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2015 USD ($) $ / shares | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥) | Jun. 30, 2015 USD ($) Tranche | Jun. 17, 2015 CNY (¥) | Jun. 09, 2014 USD ($) | Aug. 06, 2013 USD ($) | Nov. 28, 2012 USD ($) Tranche
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  | $ 4,765,399 |  | ¥ 21,700,000 |  | ¥ 30,869,300 |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Seventeen |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  | $ 750,000
Debt, maturity date |  | Nov. 28, 2017 | Nov. 28, 2017 |  |  |  |  |  |  |  |
Interest rate |  | 2.25% |  |  |  | 2.25% |  |  |  |  |
Effective interest rate |  | 2.36% |  |  |  | 2.36% |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty Two |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  |  | $ 750,000
Debt, maturity date |  | Nov. 28, 2022 | Nov. 28, 2022 |  |  |  |  |  |  |  |
Interest rate |  | 3.50% |  |  |  | 3.50% |  |  |  |  |
Effective interest rate |  | 3.59% |  |  |  | 3.59% |  |  |  |  |
Unsecured Senior Notes Due Twenty Eighteen |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  |  | $ 1,000,000 |
Debt, maturity date |  | Aug. 06, 2018 | Aug. 06, 2018 |  |  |  |  |  |  |  |
Interest rate |  | 3.25% |  |  |  | 3.25% |  |  |  |  |
Effective interest rate |  | 3.39% |  |  |  | 3.39% |  |  |  |  |
Unsecured Senior Notes Due Twenty Nineteen |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  | $ 1,000,000 |  |
Debt, maturity date |  | Jun. 09, 2019 | Jun. 09, 2019 |  |  |  |  |  |  |  |
Interest rate |  | 2.75% |  |  |  | 2.75% |  |  |  |  |
Effective interest rate |  | 3.00% |  |  |  | 3.00% |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 750,000 |  |  |  |
Debt, maturity date |  | Jun. 30, 2020 | Jun. 30, 2020 |  |  |  |  |  |  |  |
Interest rate |  | 3.00% |  |  |  | 3.00% |  |  |  |  |
Effective interest rate |  | 3.13% |  |  |  | 3.13% |  |  |  |  |
Unsecured Senior Notes Due Two Thousand Twenty Five |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  | $ 500,000 |  |  |  |
Debt, maturity date |  | Jun. 30, 2025 | Jun. 30, 2025 |  |  |  |  |  |  |  |
Interest rate |  | 4.13% |  |  |  | 4.13% |  |  |  |  |
Effective interest rate |  | 4.22% |  |  |  | 4.22% |  |  |  |  |
Unsecured Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of tranches issued and sold | Tranche |  |  |  |  |  |  | 2 |  |  |  | 2
Net proceeds from issuance of debt |  | $ 1,200,000 | ¥ 7,750,000 | ¥ 6,190,000 | ¥ 6,110,000 |  |  |  |  |  |
Discount on debt issued |  | 11,480 |  |  |  | ¥ 74,360 |  |  |  |  |
Debt issuance cost |  | $ 23,090 | ¥ 149,590 |  |  |  |  |  |  |  |
senior unsecured convertible notes | Qunar |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 500,000 |  |  |  |  |  |  |  |  |  |
Debt, maturity date | Jun. 17, 2021 |  |  |  |  |  |  |  |  |  |
Interest rate | 2.00% |  |  |  |  |  |  | 2.00% |  |  |
Initial conversion price | $ / shares | $ 55.00 |  |  |  |  |  |  |  |  |  |
Equity component of notes | $ 87,870 |  |  |  |  |  |  | ¥ 569,220 |  |  |
Debt component of notes | 391,300 |  |  |  |  |  |  | 2,530,000 |  |  |
Debt issuance costs | $ 6,630 |  |  |  |  |  |  | ¥ 42,940 |  |  |

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