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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Aug. 09, 2018
May 07, 2018
Feb. 22, 2018
Business Acquisition [Line Items]                            
Business Combination, Costs Expensed Not Considered Ongoing                     $ 15,000      
Acquisition related costs                 $ 0 $ 5,871 344      
Revenues $ 198,632 $ 213,897 $ 221,666 $ 213,256 $ 199,477 $ 205,683 $ 197,010 $ 168,487            
Income (loss) from operations                 $ 9,889 (179,864) 31,780      
Paragon Medical                            
Business Acquisition [Line Items]                            
Acquisition percentage                         100.00%  
Revenues                   116,998        
Income (loss) from operations                   $ 8,086 $ 0      
Bridgemedica, LLC                            
Business Acquisition [Line Items]                            
Acquisition percentage                           100.00%
Southern California Technical Arts, Inc.                            
Business Acquisition [Line Items]                            
Acquisition percentage                       100.00%