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Income Taxes - Reconciliation of the Differences (Detail)
¥ in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2017

CNY (¥)

Dec. 31, 2017

USD ($)

Dec. 31, 2016

CNY (¥)

Dec. 31, 2015

CNY (¥)

Income (loss) before income tax

¥ 1,433,265

$ 220,288

¥ (68,896)

¥ 238,377

Income tax expense (benefit) computed at the PRC statutory tax rate of 25%

358,316

55,072

(17,224)

59,594

Effect of different tax rates in different jurisdictions

(119,565)

(18,376)

(18,988)

(21,538)

Effect of tax holiday and preferential tax rates

(80,671)

(12,399)

(20,969)

(35,434)

Research and development super-deduction

(50,223)

(7,719)

(54,081)

(47,179)

Non-taxable income

^[1]

(188,139)

(28,916)

(6,484)

(251)

Non-deductible expenses

^[2]

71,039

10,918

81,569

84,599

Effect of change in tax rate

7,279

1,119

5,009

1,464

Outside basis difference on investment in VIEs

9,808

1,507

(2,847)

11,378

Withholding tax and others

18,149

2,789

10,962

6,160

Changes in valuation allowance

31,609

4,858

10,864

4,947

Income tax expenses (benefits)

¥ 57,602

$ 8,853

¥ (12,189)

¥ 63,740

[1]	Non-taxable income mainly consist of gains on disposal of subsidiaries and long-term investments that are not subject to tax under the tax laws of different jurisdictions.
[2]	Non-deductible expenses mainly consist of share-based compensation expenses, entertainments and other expenses that are not allowed to be deducted under the tax laws of different jurisdictions.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because effect of preferential tax rate on deferred tax.

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