Fair Value Measurement - Additional Information (Detail) (Fair Value, Measurements, Nonrecurring, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Measurements, Nonrecurring
Assets Measured On Nonrecurring Basis [Line Items]
Fair values reduced by estimated costs to sell	$ 0.3	$ 0