Leases - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases Disclosure [Line Items]
Total rent expenses	$ 9.4	$ 9.9	$ 11.1
Accumulated depreciation on capital leases	0.40	0.30
Depreciation expense	0.14	0.16	0.17
Gross capital lease obligation	0.45
Current Liability For Capital Lease Obligations
Leases Disclosure [Line Items]
Gross capital lease obligation	0.17
Non Current Liability For Capital Lease Obligations
Leases Disclosure [Line Items]
Gross capital lease obligation	0.28
Property, Plant and Equipment, Other Types
Leases Disclosure [Line Items]
Leasehold Improvements on capital leases	$ 0.96	$ 1.09