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Schedule of Investments at Amortized Cost and Fair Value (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Other Long-term Investments | Equity Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Available-for-sale investments, cost or amortized cost |  |  | ¥ 527,596 | ¥ 322,269
Available-for-sale investments, gross unrealized gains (losses) |  |  | (31,084) | (45,304)
Available-for-sale investments noncurrent, fair value |  | $ 71,513 | 496,512 | 276,965
Other Long-term Investments | Fixed-rate Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Long-term held-to-maturities investments, cost or amortized cost |  |  |  | 1,838,953
Held-to-maturity investments, gross unrecognized holding losses |  |  |  | (32,507)
Held-to-maturity investments, fair value |  |  |  | 1,806,446
Short-term Investments | Equity Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Available-for-sale investments, cost or amortized cost |  |  | 32,899 | 600,543
Available-for-sale investments, gross unrealized gains (losses) |  |  |  | 142,075
Available-for-sale investments, gross unrealized losses |  |  | (4,112) |
Available-for-sale investments current, fair value |  | 4,146 | 28,787 | 742,618
Short-term Investments | Fixed-rate Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Short-term held-to-maturity investments, cost or amortized cost |  |  | 41,802,170 | 36,942,840
Held-to-maturity investments, gross unrecognized holding gains |  |  | 70,018 | 197,848
Held-to-maturity investments, gross unrecognized holding losses |  |  | (3,547) | (6,592)
Held-to-maturity investments, fair value |  | 6,030,339 | 41,868,641 | 37,134,096
Available-for-sale investments, cost or amortized cost |  |  | 14,352,711 | 6,872,077
Available-for-sale investments, gross unrealized gains |  |  | 31,197 |
Available-for-sale investments, gross unrealized gains (losses) |  |  |  | 86,322
Available-for-sale investments, gross unrealized losses |  |  | (6,052) |
Available-for-sale investments current, fair value |  | 2,070,842 | 14,377,856 | 6,958,399
Short-term Investments | Adjustable-rate Debt Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Available-for-sale investments, cost or amortized cost |  |  | 14,673,620 | 13,137,500
Available-for-sale investments, gross unrealized gains |  |  | 313,196 |
Available-for-sale investments, gross unrealized gains (losses) |  |  |  | 187,885
Available-for-sale investments current, fair value |  | 2,158,550 | 14,986,816 | ¥ 13,325,385
Trading Securities |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Trading securities, cost or amortized cost |  |  | 7,685,697 |
Trading securities, gross unrealized gains | ¥ 61,739 |  |  |
Trading securities, fair value |  | $ 1,115,863 | ¥ 7,747,436 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562 + Details
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