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           Acquisitions - Summary of Final Amounts Allocated to Acquired Assets and Assumed Liabilities (Detail) (USD $) 
        In Thousands, unless otherwise specified  | 
        
           Jun. 30, 2014 
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           Dec. 31, 2013 
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           Dec. 31, 2012 
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|---|---|---|---|
| Business Acquisition [Line Items] | |||
| Goodwill | $ 20,008 | $ 20,031 | $ 15,891 | 
| 
           Ten-Sixty 
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        |||
| Business Acquisition [Line Items] | |||
| Goodwill | 2,345 | ||
| Total purchase consideration | 4,092 | ||
| 
           Customer Relationships | Ten-Sixty 
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        |||
| Business Acquisition [Line Items] | |||
| Intangible asset | 1,650 | ||
| 
           Non-compete Agreements | Ten-Sixty 
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        |||
| Business Acquisition [Line Items] | |||
| Intangible asset | $ 97 | 
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- Details 
          
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- Definition 
          The amount of identifiable intangible assets recognized as of the acquisition date. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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