Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingencies Disclosure [Abstract]
Rental expense	$ 92.7	$ 96.8	$ 100.6
Future purchase commitments	55
Purchase commitment period	3 years
Allegations loss	$ 0