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Components of Income Tax (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Income Tax Disclosure [Abstract] |  |  |  |
Current income tax | $ 498,612 | ¥ 3,461,853 | ¥ 3,213,638 | ¥ 2,942,173
Income tax refund due to reduced tax rate | (77,013) | (534,698) | 0 | (17,553)
Adjustments of deferred tax assets due to change in tax rates | (1,741) | (12,085) | 79,947 | 28,146
Deferred income tax (benefit) expense | (213) | (1,476) | 2,180,792 | (721,594)
Taxation for the year | $ 419,645 | ¥ 2,913,594 | ¥ 5,474,377 | ¥ 2,231,172

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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