Share-Based Compensation - Schedule of Share and Dividend Equivalent Share Award Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Value of share equivalents
Market price of Company's stock (in usd per share)	$ 75.54	$ 81.35
Phantom Stock and Performance Stock Units
Number of share equivalents
Balance at beginning of the period (in shares)	353,407,000	393,844,000
Granted (in shares)	183,879,000	151,908,000
Forfeited share equivalents (in shares)	(30,283,000)	(59,550,000)
Vested share equivalents (in shares)	(107,592,000)	(130,497,000)
Balance at end of the period (in shares)	399,411,000	355,705,000
Value of share equivalents
Balance at beginning of the period (in shares)	$ 22,717	$ 30,523
Granted (in shares)	13,890	12,358
Forfeited share equivalents (in shares)	2,288	4,844
Vested share equivalents (in shares)	8,116	10,871
Balance at end of the period (in shares)	$ 30,171	$ 28,937