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Share-based payments - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) award shares | Dec. 31, 2020 £ / shares | Dec. 31, 2019 USD ($) award shares | Dec. 31, 2019 £ / shares | Dec. 31, 2018 USD ($) award shares
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Vesting period of share awards | 3 years |  |  |  |
Share based payment cost | $ | $ 19,000 |  | $ 28,000 |  | $ 27,000
Weighted average share price at exercise date | £ / shares |  | £ 48.745 |  | £ 45.848 |
Share based payment cash-settled | $ | 2,000 |  | 2,000 |  | 0
System Fund [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Share based payment cost | $ | $ 11,000 |  | 12,000 |  | 11,000
Administrative expenses [member] | Exceptional items [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Share based payment cost | $ |  |  | $ 2,018,000 |  | $ 1,000
Maximum [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
IHG share price | £ / shares |  | 52.23 |  |  |
Minimum [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
IHG share price | £ / shares |  | 23.855 |  |  |
Closing [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
IHG share price | £ / shares |  | £ 46.90 |  |  |
Annual Performance Plan [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 138,268 |  | 217,000 |  | 175,944
Annual Performance Plan one-off awards | shares | 27,245 |  | 86,126 |  | 48,771
Long Term Incentive Plan [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 1,078,752 |  | 826,313 |  | 784,119
LTIP Restricted stock units [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 696,094 |  | 539,567 |  | 526,879
LTIP Performance-related awards [member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 383,000 |  | 286,746 |  | 257,000
Colleague Share Plan [Member] |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |
Number of shares awarded to employees | award | 36,298 |  | 0 |  | 0
Maximum Limit of share value to employees | $ | $ 1,000 |  |  |  |

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