Annual report pursuant to Section 13 and 15(d)

Acquisitions and Recent Transactions - Summary of Total Acquisition Consideration (Detail)

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Acquisitions and Recent Transactions - Summary of Total Acquisition Consideration (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Business Combination, Consideration Transferred [Abstract]    
Cash payments made upon closing $ 10,854 $ 3,972
Deferred payments 150  
Escrow deposits paid in prior years   35
Present value of estimated fair value of contingent earn-out consideration 51  
Present value of estimated fair value of contingent earn-out consideration   36
Closing costs accrued for asset acquisitions 125  
Total purchase price consideration   4,043
Total purchase price consideration $ 11,180 $ 4,043