Share-based Compensation - Summary of Cash-Settled SARs Activity (Detail) - Cash-Settled SARs Activity [Member]	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	58,428
Exercised (in shares) | shares	(52,298)
Expired or forfeited (in shares) | shares	(1,193)
Outstanding, ending balance (in shares) | shares	4,937
Weighted-Average Exercise Price
Outstanding, weighted-average exercise price, beginning balance (in dollars per share) | $ / shares	$ 30.71
Exercised (in dollars per share) | $ / shares	30.39
Expired or forfeited (in dollars per share) | $ / shares	19.37
Outstanding, weighted-average exercise price, ending balance (in dollars per share) | $ / shares	$ 36.80