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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2019
Jan. 01, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]              
Finance lease, right-of-use asset $ 440   $ 440     $ 505  
Operating lease liabilities, current and long-term portions 25,450   25,450     28,577  
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 8,110 $ 18,248 8,191 $ 23,255      
Income tax expense 3,470 $ 3,972 3,635 $ 4,946      
Deferred tax liabilities, long-term, net 25,546   25,546     24,408  
Retained earnings $ 87,869   $ 87,869     83,313  
Revision of Prior Period, Adjustment [Member]              
Error Corrections and Prior Period Adjustments Restatement [Line Items]              
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest         $ 1,800    
Income tax expense         $ 387    
Other Assets, Current           1,800  
Deferred tax liabilities, long-term, net           387  
Retained earnings           $ 1,413  
Accounting Standards Update 2016-02              
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]              
Finance lease, right-of-use asset             $ 35,939