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Investment in Equity Investees (Detail) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2013 CNY (¥) | Apr. 30, 2012 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥) | Jun. 30, 2016 USD ($) | Jun. 30, 2016 CNY (¥)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in an equity investee, addition |  |  |  | ¥ 162,176 | ¥ 49,000 |  |  |  |
Share equity gain, during period |  |  | $ 8,266 | 53,783 | 35,652 | ¥ 52,355 |  |  |
Cost investment |  |  |  |  | 150,000 | 101,000 | ¥ 312,176 |  |
Accumulated, share equity gain (loss) |  |  |  |  | 84,863 | 49,211 | 138,646 |  |
Investment in equity investee |  |  | 69,290 |  | 234,863 | 150,211 | 450,822 |  |
Yizhuang Venture Investment Fund |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in an equity investee, addition | ¥ 50,500 | ¥ 50,500 |  |  |  |  |  |  |
Share equity gain, during period |  |  |  | 90,888 | 35,937 |  |  |  |
Cost investment |  |  |  |  | 101,000 | 101,000 | 101,000 |  |
Accumulated, share equity gain (loss) |  |  |  |  | 85,148 | 49,211 | 176,036 |  |
Investment in equity investee |  |  | 42,580 |  | 186,148 | ¥ 150,211 | 277,036 |  |
Unis Tech |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in an equity investee, addition |  |  |  |  | 49,000 |  |  |  |
Share equity gain, during period |  |  |  | (12,676) | (285) |  |  |  |
Cost investment |  |  |  |  | 49,000 |  | 49,000 | $ 7,057 | ¥ 49,000
Accumulated, share equity gain (loss) |  |  |  |  | (285) |  | (12,961) |  |
Investment in equity investee |  |  | 5,539 |  | ¥ 48,715 |  | 36,039 |  |
Shihua DC Investment Holdings Limited |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in an equity investee, addition |  |  |  | 147,176 |  |  |  |  |
Share equity gain, during period |  |  |  | (9,429) |  |  |  |  |
Cost investment |  |  |  |  |  |  | 147,176 |  |
Accumulated, share equity gain (loss) |  |  |  |  |  |  | (9,429) |  |
Investment in equity investee |  |  | $ 21,171 |  |  |  | 137,747 |  |
WiFire Group Inc. ("WiFire Group") |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |
Investment in an equity investee, addition |  |  |  | 15,000 |  |  |  |  |
Share equity gain, during period |  |  |  | ¥ (15,000) |  |  |  |  |
Cost investment |  |  |  |  |  |  | 15,000 |  |
Accumulated, share equity gain (loss) |  |  |  |  |  |  | ¥ (15,000) |  |

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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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