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Stock-based Compensation - Summary of SARs Activity (Detail) - SARs [Member]
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares, Beginning Balance | shares 655,417
Granted, Shares | shares 176,330
Exercised, Shares | shares (172,826)
Forfeited, Shares | shares (5,423)
Shares, Ending Balance | shares 653,498
Weighted Average Exercise Price, Beginning Balance | $ / shares $ 68.83
Granted, Weighted Average Exercise Price | $ / shares 101.96
Exercised, Weighted Average Exercise Price | $ / shares 57.32
Forfeited, Weighted Average Exercise Price | $ / shares 89.63
Weighted Average Exercise Price, Ending balance | $ / shares $ 80.64
Weighted Average Remaining Contractual Term, Ending balance 7 years 1 month 13 days
Aggregate Intrinsic Value, Ending balance | $ $ 25,297