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Business Acquisitions and Dispositions - Assets and Liabilities Classified as Held for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Business Combinations [Abstract] |  |
Inventories | $ 7,630 |
Property and equipment, net | 6,170 | 4,101
Goodwill | 1,011 |
Assets held for sale | 14,811 | 4,101
Liabilities associated with assets held for sale - non-trade | $ 6,587 |

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