Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases Future Minimum Payments [Line Items]
Rental expense for operating leases	$ 12.9	$ 13.6	$ 14.8
Sublease income	0.7	0.6	0.9
One-time payment for operating lease expense			0.9
Future remediation cost	0.6
Maximum [Member]
Leases Future Minimum Payments [Line Items]
Estimated remediation cost	$ 0.5	$ 0.5	$ 0.5