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Acquisitions - Schedule of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Business Acquisition [Line Items]      
Goodwill $ 551,367 $ 528,424  
Pacific Coastal Pension and Insurance Services, Inc. [Member]      
Business Acquisition [Line Items]      
Accounts receivable, net 1,255   $ 161
Identifiable intangible assets 457   897
Current liabilities (805)   (309)
Total identifiable net assets 907   749
Goodwill 22,943   1,515
Aggregate purchase price $ 23,850   $ 2,264