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Condensed Financial Information of the Company - Consolidated Statement of Comprehensive Income (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Revenues | ¥ 4,974,757 | $ 764,606 | ¥ 4,564,650 | ¥ 3,773,877
Cost of revenues | (1,780,089) | (273,595) | (1,543,817) | (956,353)
Gross profit | 3,194,668 | 491,011 | 3,020,833 | 2,817,524
Operating expenses |  |  |  |
Research and development | (684,863) | (105,262) | (905,854) | (695,185)
Selling and marketing | (1,656,505) | (254,600) | (1,650,581) | (1,505,951)
General and administrative | (407,410) | (62,618) | (561,834) | (447,984)
Interest income (expense), net | 22,603 | 3,474 | 7,783 | 14,550
Losses from equity method investments, net | 495 | 76 | (11,363) | (12,144)
Impairment of investments | (275,026) | (42,271) | (141,069) | (34,728)
Settlement and changes in fair value of contingent considerations | (9,014) | (1,385) | (3,377) | 7,011
Foreign exchange gain (loss), net | (15,224) | (2,340) | 3,747 | (213)
Other income, net | 1,262,551 | 194,051 | 87,831 | 47,003
Income (Loss) before income taxes | 1,433,265 | 220,288 | (68,896) | 238,377
Income tax expenses | (57,602) | (8,853) | 12,189 | (63,740)
Net income (loss) attributable to Cheetah Mobile Inc. | 1,348,194 | 207,213 | (80,525) | 176,347
Other comprehensive income (loss), net of tax of nil |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net | (433) | (67) | 1,241 | 9,729
Foreign currency translation adjustments | (148,304) | (22,794) | 132,450 | 115,515
Total comprehensive income attributable to Cheetah Mobile Inc. | 1,204,255 | 185,090 | 28,504 | 293,262
Parent Company [Member] |  |  |  |
Revenues | 52,053 | 8,000 | 105,497 | 196,640
Cost of revenues | (6,919) | (1,063) | (15,993) | (20,531)
Gross profit | 45,134 | 6,937 | 89,504 | 176,109
Operating expenses |  |  |  |
Research and development | (11,370) | (1,748) | (61,389) | (74,426)
Selling and marketing | (84) | (13) | (347) | (107)
General and administrative | (18,931) | (2,910) | (33,153) | (31,279)
Total operating expenses | (30,385) | (4,671) | (94,889) | (105,812)
Equity in profit (loss) of subsidiaries | 1,346,556 | 206,962 | (94,219) | 133,246
Interest income (expense), net | (6,525) | (1,003) | (3,213) | 7,169
Losses from equity method investments, net | (159) | (24) | (352) | (42)
Impairment of investments |  |  |  | (25,891)
Settlement and changes in fair value of contingent considerations |  |  | (240) | (707)
Foreign exchange gain (loss), net | (3,877) | (596) | 4,385 | 389
Other income, net |  |  | 25,211 | 1,620
Income (Loss) before income taxes | 1,350,744 | 207,605 | (73,813) | 186,081
Income tax expenses | (2,550) | (392) | (6,712) | (9,734)
Net income (loss) attributable to Cheetah Mobile Inc. | 1,348,194 | 207,213 | (80,525) | 176,347
Other comprehensive income (loss), net of tax of nil |  |  |  |
Unrealized gain (loss) on available-for-sale securities, net | (433) | (67) | (20,425) | 2,915
Foreign currency translation adjustments | (143,506) | (22,056) | 129,454 | 114,000
Other comprehensive (loss) income | (143,939) | (22,123) | 109,029 | 116,915
Total comprehensive income attributable to Cheetah Mobile Inc. | ¥ 1,204,255 | $ 185,090 | ¥ 28,504 | ¥ 293,262

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