Fair Value Measurements - Outstanding Interest Rate Swaps (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($)
US Dollar term loan floating-to-fixed rate swaps maturing on May 2016
Derivative Instruments Gain Loss [Line Items]
Derivative financial instruments outstanding	$ 1,575,000,000
Maturity Date	May 01, 2016
US Dollar term loan floating-to-fixed rate swaps maturing on November 2016
Derivative Instruments Gain Loss [Line Items]
Derivative financial instruments outstanding	$ 500,000,000
Maturity Date	Nov. 01, 2016
US Dollar term loan floating-to-fixed rate swaps maturing on September 2017
Derivative Instruments Gain Loss [Line Items]
Derivative financial instruments outstanding	$ 250,000,000
Maturity Date	Sep. 01, 2017
US Dollar term loan floating-to-fixed rate swaps maturing on May 2018
Derivative Instruments Gain Loss [Line Items]
Derivative financial instruments outstanding	$ 250,000,000
Maturity Date	May 01, 2018
US Dollar term loan floating-to-fixed rate swaps maturing on April 2019
Derivative Instruments Gain Loss [Line Items]
Derivative financial instruments outstanding	$ 150,000,000
Maturity Date	Apr. 01, 2019
US Dollar term loan floating-to-fixed rate swaps maturing on July 2019
Derivative Instruments Gain Loss [Line Items]
Derivative financial instruments outstanding	$ 150,000,000
Maturity Date	Jul. 01, 2019