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Condensed Financial Information of the Parent Company - Summary of Parent Company Cash Flow (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Net cash (used in) generated from operating activities | ¥ (708,869) | $ (111,236) | ¥ (290,433) | ¥ (439,132)
Net cash generated from (used in) investing activities | (421,623) | (66,162) | (4,314,003) | 883,247
Net cash generated from (used in) financing activities | 2,212,487 | 347,187 | 6,124,153 | 64,507
Effect of exchange rate changes on cash and cash equivalents | (50,048) | (7,854) | (118,306) | 7,570
Net increase in cash, cash equivalents, and restricted cash | 1,081,995 | 169,789 | 1,519,717 | 508,622
Cash, cash equivalents, and restricted cash at beginning of year | 3,424,674 |  |  |
Cash, cash equivalents, and restricted cash at end of year | 4,217,528 | 661,822 | 3,424,674 |
Parent Company [Member] |  |  |  |
Net cash (used in) generated from operating activities | 1,178,019 | 184,857 | (6,203,310) | (2,538,479)
Net cash generated from (used in) investing activities | (1,179,393) | (185,072) | (218,674) | 2,166,312
Net cash generated from (used in) financing activities | (815) | (128) | 5,945,666 | 370,294
Effect of exchange rate changes on cash and cash equivalents | 3,570 | 559 | 3,969 | 10,921
Net increase in cash, cash equivalents, and restricted cash | 1,381 | 216 | (472,349) | 9,048
Cash, cash equivalents, and restricted cash at beginning of year | 68,012 | 10,673 | 540,361 | 531,313
Cash, cash equivalents, and restricted cash at end of year | ¥ 69,393 | $ 10,889 | ¥ 68,012 | ¥ 540,361

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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