XML 66 R41.htm IDEA: XBRL DOCUMENT v2.4.0.6
Fair Value Measurements - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Derivative Instruments And Hedging Activities Disclosure [Abstract]  
Pre-tax losses from accumulated other comprehensive loss to interest expense expected to be recognized in next twelve months $ 12