Share-Based Compensation and Other Employee Benefit Plans - Schedule of Share and Dividend Equivalent Share Award Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Value of share equivalents
Market price of Company's stock (in dollars per share)	$ 74.83	$ 64.28	$ 77.50
Phantom Stock and Performance Stock Units
Number of share equivalents
Balance at beginning of the period (in shares)	353,407	393,844	472,830
Granted (in shares)	192,524	157,044	118,408
Forfeited share equivalents (in shares)	(34,362)	(63,276)	(34,968)
Vested share equivalents (in shares)	(112,052)	(134,205)	(162,426)
Balance at end of the period (in shares)	399,517	353,407	393,844
Value of share equivalents
Balance at beginning of the period	$ 22,717	$ 30,523	$ 39,600
Granted	14,407	10,095	9,177
Forfeited share equivalents	2,571	4,067	2,710
Vested share equivalents	34,566	11,156	13,515
Balance at end of the period	$ 29,896	$ 22,717	$ 30,523