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Quarterly Results of Operations (Unaudited) - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2016
Business
Dec. 31, 2015
USD ($)
Business
Dec. 31, 2014
USD ($)
Business
Interim Reporting [Line Items]        
Number of acquisitions | Business   0 2 4
Merger and acquisition related costs before tax     $ 11,682 $ 9,248
PEP [Member]        
Interim Reporting [Line Items]        
Merger and acquisition related costs before tax $ 18,700      
Merger and acquisition related costs after tax 11,600      
Debt issuance Cost Write Off Before Tax 18,700      
Debt issuance Cost Write Off After Tax $ 12,000