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Share-based Payment Expense - Summary of Options Granted Under 2010 and 2021 Savings-Related Share Option Schemes (Detail)
 1 Months Ended 12 Months Ended
Oct. 31, 2021
shares
May 31, 2019
shares
Apr. 30, 2019
shares
Dec. 31, 2021
shares
Options
€ / shares
Dec. 31, 2021
shares
Options
£ / shares
€ / shares
Dec. 31, 2020
shares
Options
€ / shares
Dec. 31, 2020
shares
Options
£ / shares
€ / shares
Dec. 31, 2019
shares
Options
€ / shares
Dec. 31, 2019
shares
Options
£ / shares
€ / shares
Dec. 31, 2021
shares
£ / shares
Dec. 31, 2020
shares
£ / shares
Dec. 31, 2019
shares
£ / shares
Disclosure Of Share Based Compensation Expense [line items]                        
Number of options, Exercised | Options       (521,523) (521,523) (256,521) (256,521) (1,147,149) (1,147,149)      
2010 and 2021 Savings Related Share Option Schemes [member]                        
Disclosure Of Share Based Compensation Expense [line items]                        
Weighted average exercise price, Outstanding at beginning of year | (per share)       € 23.83 £ 19.69 € 23.67 £ 20.17 € 22.15 £ 18.74      
Weighted average exercise price, Exercised | (per share) [1]       22.77 18.69 23.21 22.37 19.09 16.20      
Weighted average exercise price, Lapsed | (per share)       24.75 21.49 23.25 21.54 23.49 20.85      
Weighted average exercise price, Granted | (per share) [2]         31.04     24.24 20.11      
Weighted average exercise price, Outstanding at end of year | (per share)       24.28 £ 25.42 23.83 £ 19.69 23.67 £ 20.17      
Weighted average exercise price, Exercisable at end of year | (per share)       € 23.27 £ 23.27 € 24.66 £ 24.66 € 18.88 £ 18.88 £ 20.56 £ 24.51 £ 15.89
Number of options, Outstanding at beginning of year       1,173,507 1,173,507 1,508,862 1,508,862 1,686,176 1,686,176      
Number of options, Exercised [1]       (470,001) (470,001) (178,773) (178,773) (627,034) (627,034)      
Number of options, Lapsed       (73,411) (73,411) (156,582) (156,582) (207,070) (207,070)      
Number of options, Granted 455,068 100,297 556,493 455,068 [2] 455,068 [2] 0 0 656,790 [2] 656,790 [2]      
Number of options, Outstanding at end of year       1,085,163 1,085,163 1,173,507 1,173,507 1,508,862 1,508,862      
Number of options, Exercisable at end of year       14,197 14,197 16,528 16,528 13,065 13,065 14,197 16,528 13,065
[1] The weighted average share price at the date of exercise of these options was €42.53 (2020: €31.70; 2019: €28.52).
[2] Pursuant to the 2010 and 2021 Savings-related Share Option Schemes operated by the Group, employees were granted options over 455,068 of CRH plc’s Ordinary Shares in October 2021 (2020: nil; 2019: 556,493 share options in April 2019 and 100,297 share options in May 2019). This figure comprises options over 346,237 (2020: nil; 2019: 518,944) shares and 108,831 (2020: nil; 2019: 137,846) shares which are normally exercisable within a period of six months after the third or the fifth anniversary of the contract, whichever is applicable. The exercise price at which the options are granted under the scheme represents a discount of 15% to the market price on the date of invitation of each savings contract.