Annual report pursuant to Section 13 and 15(d)

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

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Acquisitions - Summary of Final Amounts Allocated to Acquired Assets and Assumed Liabilities (Parenthetical) (Detail) - Jamison
 12 Months Ended
Dec. 31, 2016
Customer Relationships  
Business Acquisition [Line Items]  
Intangible asset life 10 years
Non-compete Agreements  
Business Acquisition [Line Items]  
Intangible asset life 5 years