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Summary of Activity of RSU and PSU Awards Under the 2019 Plan (Detail) - 2019 Plan - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
RSU and PSU      
Beginning Balance 625,250 721,901 657,620
Share units granted 282,984 207,790 384,428
Share units vested (202,694) (285,688) (300,404)
Share units forfeited (1,239) (18,753) (19,743)
Ending Balance 704,301 625,250 721,901
Total share units outstanding and expected to vest at period end 668,146    
RSU      
RSU and PSU      
Beginning Balance 343,860 538,341 657,620
Share units granted 137,969 102,956 200,868
Share units vested (202,694) (278,684) (300,404)
Share units forfeited (1,239) (18,753) (19,743)
Ending Balance 277,896 343,860 538,341
PSU      
RSU and PSU      
Beginning Balance [1] 281,390 183,560  
Share units granted [1] 145,015 104,834 183,560
Share units vested [1]   (7,004)  
Ending Balance [1] 426,405 281,390 183,560
RSU and PSU      
Weighted average grant date fair value      
Beginning Balance $ 25.37 $ 14.55 $ 11.95
Share units granted 34.86 44.62 16.96
Share units vested 16.85 12.32 12.08
Share units forfeited 35.30 12.70 12.62
Ending Balance 31.62 $ 25.37 $ 14.55
Total share units outstanding and expected to vest at December 31, 2022 $ 31.37    
[1] The grant date fair value of PSU awards granted during 2022, 2021 and 2020 were $42.36 per share, $55.85 per share and $22.06 per share, respectively. On the settlement date for each measurement period of market-based awards, grantees may receive shares equal to 0% to 200% of the awards granted depending upon the achievement of certain market criteria based on the Company’s TSR relative to the peer group during the three-year performance period.