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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Leased Assets [Line Items]
Rent expense	$ 22.0	$ 20.8	$ 19.4
Renewal period of employment agreements	1 year
Minimum notice period	Dec. 31, 2015
Future compensation - 2014	18.1
Future compensation - 2015 through 2018	$ 4.5
Executive Officer [Member]
Operating Leased Assets [Line Items]
Number of officers with the company had employee agreement	3
Maximum [Member]
Operating Leased Assets [Line Items]
Operating leases renewal period	5 years
Minimum [Member]
Operating Leased Assets [Line Items]
Operating leases renewal period	1 year