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Segment Information - Summary of Revenue from Each Segment, Income (Loss) from Operations (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: |  |  |  |  |
Revenues |  | ¥ 4,974,757 | $ 764,606 | ¥ 4,564,650 | ¥ 3,773,877
Operating income (loss): |  |  |  |  |
Total consolidated operating income (loss) |  | 446,880 | 68,683 | (12,448) | 216,898
Operating Segments [Member] |  |  |  |  |
Operating income (loss): |  |  |  |  |
Total consolidated operating income (loss) |  | 520,196 | 79,951 | 293,701 | 532,638
Corporate, Non-Segment [Member] |  |  |  |  |
Operating income (loss): |  |  |  |  |
Unallocated expenses | [1] | (73,316) | (11,268) | (306,149) | (315,740)
Utility Product and Related Services [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 3,439,563 | 528,651 | 3,870,995 | 3,465,239
Utility Product and Related Services [Member] | Operating Segments [Member] |  |  |  |  |
Operating income (loss): |  |  |  |  |
Total consolidated operating income (loss) |  | 979,447 | 150,537 | 843,518 | 737,668
Mobile Entertainment [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 1,496,443 | 229,999 | 693,195 | 281,671
Mobile Entertainment [Member] | Operating Segments [Member] |  |  |  |  |
Operating income (loss): |  |  |  |  |
Total consolidated operating income (loss) |  | (417,350) | (64,146) | (531,989) | (115,283)
Others [Member] |  |  |  |  |
Revenues: |  |  |  |  |
Revenues |  | 38,751 | 5,956 | 460 | 26,967
Others [Member] | Operating Segments [Member] |  |  |  |  |
Operating income (loss): |  |  |  |  |
Total consolidated operating income (loss) |  | ¥ (41,901) | $ (6,440) | ¥ (17,828) | ¥ (89,747)
[1] | Unallocated items include share-based compensation which are not allocated to segments.

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