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Stock-based compensation - Schedule of PU activity (Detail)
 12 Months Ended
Dec. 31, 2022
$ / shares
shares
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Weighted Average Grant Date Fair Value      
Outstanding weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares $ 39.40    
Outstanding weighted average grant date fair value, ending balance (in dollars per share) | $ / shares   $ 39.40  
Maximum shares eligible to receive      
Outstanding maximum shares eligible to receive, beginning balance (in shares) 4,583,155 4,876,196  
Outstanding maximum shares eligible to receive, ending balance (in shares)   4,583,155 4,876,196
Performance Units      
Number of Performance Units      
Outstanding number of shares, beginning balance (in shares) 4,583,155 4,876,196 6,058,464
Granted, number of shares (in shares) 1,590,794 1,340,877 1,253,766
Vested, number of shares (in shares) (2,161,789) (1,784,140) (1,496,377)
Forfeited, number of shares (in shares) (487,909) (258,258) (539,670)
Adjustment upon final determination of level of performance goal achievement (in shares) 46,700 408,480 (399,987)
Outstanding number of shares, ending balance (in shares) 3,570,951 4,583,155 4,876,196
Expected to vest, number of shares (in shares) 3,224,941 4,263,803 4,573,356
Weighted Average Grant Date Fair Value      
Outstanding weighted average grant date fair value, beginning balance (in dollars per share) | $ / shares $ 39.40 $ 34.56 $ 31.07
Granted, weighted average grant date fair value (in dollars per share) | $ / shares 44.50 44.06 42.49
Vested, weighted average grant date fair value (in dollars per share) | $ / shares 34.61 30.66 25.21
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares 43.52 39.97 33.77
Adjustment upon final determination of level of performance goal achievement (in dollars per share) | $ / shares 44.20 43.99 42.60
Outstanding weighted average grant date fair value, ending balance (in dollars per share) | $ / shares $ 44.07 $ 39.40 $ 34.56
Maximum shares eligible to receive      
Outstanding maximum shares eligible to receive, beginning balance (in shares) 4,583,155 4,876,196 6,058,464
Granted, maximum shares eligible to receive (in shares) 3,181,588 2,681,754 2,507,532
Vested, maximum shares eligible to receive (in shares) (2,161,789) (1,784,140) (1,496,377)
Forfeited, maximum shares eligible to receive (in shares) (642,512) (320,098) (560,867)
Adjustment upon final determination of level of performance goal achievement (in shares) (1,389,491) (870,557) (1,632,556)
Outstanding maximum shares eligible to receive, ending balance (in shares) 3,570,951 4,583,155 4,876,196
Net settlement on vesting of performance units (Note 18) (in shares) 1,300,511 1,102,440 902,532
Increase due to achievement of higher-than-target performance 1.31%    
Decrease due to achievement of lower-than-target performance   0.3120 0.3298