Share-based Compensation - Summary of Stock-Settled SARs Activity (Detail) - Stock-Settled SARs Activity [Member]	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Shares
Outstanding, beginning balance (in shares) | shares	810,759
Exercised (in shares) | shares	(178,224)
Expired or forfeited (in shares) | shares	(7,167)
Outstanding, ending balance (in shares) | shares	625,368
Weighted-Average Exercise Price
Outstanding, weighted-average exercise price, beginning balance (in dollars per share) | $ / shares	$ 33.89
Exercised (in dollars per share) | $ / shares	34.74
Expired or forfeited (in dollars per share) | $ / shares	37.85
Outstanding, weighted-average exercise price, ending balance (in dollars per share) | $ / shares	$ 33.60