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Operations and Summary of Significant Accounting Policies - Estimated Economic Life of Acquired Amortizable Intangible Assets (Detail)
12 Months Ended
Dec. 31, 2016
Minimum [Member] | Customer Relationships [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Useful Life 2 years
Minimum [Member] | Tradenames and Restrictive Covenant Agreements [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Useful Life 9 months
Maximum [Member] | Customer Relationships [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Useful Life 11 years
Maximum [Member] | Tradenames and Restrictive Covenant Agreements [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Useful Life 3 years