Capital Structure - Additional Information (Detail) - USD ($)		9 Months Ended
	Apr. 18, 2015	Sep. 30, 2015
Capital Structure [Line Items]
Repurchase of common stock, shares		13,822,818
Repurchase of common stock, per share		$ 78.96
The Bain Entities [Member]
Capital Structure [Line Items]
Repurchase of common stock, shares	3,806,460
Repurchase of common stock, per share	$ 77.26
Percentage of discount on share repurchase	1.00%
Share repurchase program authorized amount	$ 1,000,000,000
February 2015 and May 2015 Repurchase Authorizations [Member]
Capital Structure [Line Items]
Repurchase of common stock, per share		$ 78.60
Repurchase of common stock		17,629,278
February 2015 Repurchase Authorization [Member]
Capital Structure [Line Items]
Remaining repurchase of common stock		$ 0
May 2015 Repurchase Authorization [Member]
Capital Structure [Line Items]
Remaining repurchase of common stock		614,000,000
May 2015 Repurchase Authorization [Member] | Maximum [Member]
Capital Structure [Line Items]
Share repurchase program authorized amount		$ 1,000,000,000