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Acquisitions - Atlantic Central Logistics - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 0 Months Ended
Mar. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jul. 29, 2014
Atlantic Central Logistics [Member]
Business Acquisition [Line Items]          
Consideration $ 331,488       $ 36,200
Goodwill   918,485 363,448 302,847 25,300
Intangible assets acquired         $ 11,700