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Legal Matters - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Legal Settlement By Party [Line Items]
Charges related to claims	$ 10,343,000	$ 10,343,000
Robles and Barillas lawsuits [Member]
Legal Settlement By Party [Line Items]
Percentage of accepted settlement offer		92.00%
Settlement charges for individual drivers	9,300,000
Charges related to claims	10,343,000
Legal , communication and implementation charges	$ 1,000,000

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Loss contingency, percentage of claimants approving proposed settlement offer.

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Settlement offers to drivers and related costs.

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Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

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Amount of damages paid to the plaintiff in the legal matter.

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