Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Summary of Final Amounts Preliminarily Allocated to Acquired Assets and Assumed Liabilities (Parenthetical) (Detail)

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Acquisitions - Summary of Final Amounts Preliminarily Allocated to Acquired Assets and Assumed Liabilities (Parenthetical) (Detail) - Jamison
 6 Months Ended
Jun. 30, 2015
Customer Relationships  
Business Acquisition [Line Items]  
Intangible asset life 10 years
Non-compete Agreements  
Business Acquisition [Line Items]  
Intangible asset life 5 years