Fair Value Measurements - Outstanding Interest Rate Swaps (Detail)	12 Months Ended
	Dec. 31, 2014 US Dollar term loan floating-to-fixed rate swaps maturing on September 2015 USD ($)	Dec. 31, 2014 US Dollar term loan floating-to-fixed rate swaps maturing on November 2015 USD ($)	Dec. 31, 2014 Euro term loan floating-to-fixed rate swaps maturing on November 2015 EUR (€)	Dec. 31, 2014 US Dollar term loan floating-to-fixed rate swaps maturing on May 2016 USD ($)	Dec. 31, 2014 US Dollar term loan floating-to-fixed rate swaps maturing on November 2016 USD ($)	Dec. 31, 2014 US Dollar term loan floating-to-fixed rate swaps maturing on September 2017 USD ($)	Dec. 31, 2014 US Dollar term loan floating-to-fixed rate swaps maturing on May 2018 USD ($)
Derivative Instruments Gain Loss [Line Items]
Notional Amount	$ 250,000,000	$ 125,000,000	€ 125,000,000	$ 1,575,000,000	$ 500,000,000	$ 250,000,000	$ 250,000,000
Maturity Date	Sep. 01, 2015	Nov. 01, 2015	Nov. 01, 2015	May 01, 2016	Nov. 01, 2016	Sep. 01, 2017	May 01, 2018