Goodwill and Other Intangible Assets - Other Intangible Assets (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013
Finite Lived Intangible Assets [Line Items]
Estimated aggregate amortization expense for intangible assets in 2014
Estimated aggregate amortization expense for intangible assets in 2015
Estimated aggregate amortization expense for intangible assets in 2016
Estimated aggregate amortization expense for intangible assets in 2017
Estimated aggregate amortization expense for intangible assets in 2018
Customer Contracts [Member]
Finite Lived Intangible Assets [Line Items]
Acquired intangible assets, useful life	50 years