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Operating Leases - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Leases, Operating [Abstract] |
Term of non-cancellable pick-up truck leases (in years) | 1 year
Renewal options for non-cancellable pick-up truck leases, maximum (in months) | 72 months
Average pick-up truck lease term, minimum (in months) | 28 months
Average pick-up truck lease term, maximum (in months) | 36 months
Aggregate residual value guarantee | $ 56,711
Loss on disposal reserve | $ 19

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