Financial Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2013 swap	Sep. 30, 2014 Forward currency contracts [Member] contract	Sep. 30, 2014 Derivatives in Cash Flow Hedging Relationships [Member] Cross currency swap [Member]
Derivatives, Fair Value [Line Items]
Derivative instrument maturity period (years)					10 years
Number of multiple forward currency contracts matured				3
Number of interest rate swap agreements			3
Loss incurred on termination of interest rate swaps		$ 2.7
Derivative losses included in AOCI	$ 0.3