Derivatives and Hedging Activities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended			9 Months Ended				3 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2012 Derivative	Dec. 31, 2011 Derivative	Dec. 31, 2011 Interest Rate Swaps [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member]	Dec. 31, 2011 Designated as Hedging Instrument [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member]	Sep. 30, 2012 Designated as Hedging Instrument [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member]	Sep. 30, 2012 5.625 % Senior Notes due July 2013 [Member]	Dec. 31, 2011 5.625 % Senior Notes due July 2013 [Member]	Sep. 30, 2012 12% Senior Notes due February 2014 [Member]	Dec. 31, 2011 12% Senior Notes due February 2014 [Member]	Dec. 31, 2011 Foreign Exchange Option [Member] Interest Rate Swaps [Member]	Sep. 30, 2012 Foreign Exchange Option [Member] Interest Rate Swaps [Member]	Sep. 30, 2012 Foreign currency forward contracts [Member]	Dec. 31, 2011 Foreign currency forward contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Maximum original maturity period of Foreign Currency Forward Contracts														12 months
Estimated fair value of foreign currency forward contract, asset															$ 6	$ 15
Interest rate on senior notes									5.625%	5.625%	12.00%	12.00%
Cash received from termination of swaps	2										2
Terminated an interest rate swap with notional amount interest rate swaps													7
Increase (decrease) in carrying value due to interest rate swap					6
Increase (decrease) in interest expense due to interest rate swap				0.2	1.0	2.0	0.7	4.0
Mark to market adjustment to record Increase or decrease in the carrying amount of the 12% and 5.625% Senior Notes			$ 2
Number of foreign exchange options outstanding	0	0
Number of interest rate and Currency swap agreements outstanding	0	0