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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Income Tax [Line Items]                            
Tax at statutory rate                   21.00% 35.00% 35.00%    
Effective tax rate                   27.17% 21.94% 36.80%    
Income tax benefit resulting from the reduction of deferred tax liabilities         $ (70,000)                  
Effective income tax rate favorable impact of change in uncertain tax positions                         $ 10,600  
Increase (decrease) in net deferred tax liability                   $ (23,600)        
Increase in allowance for uncollectible accounts                   114,800        
Accounting method changes $ 109,418       4,150         109,418 $ 4,150      
Decrease in accrual to cash adjustment                   31,300        
Adjustment to additional paid-in capital for excess tax benefits related to stock-based awards                       $ 4,200    
Income tax expense for excess tax deficiencies                   1,400 200      
Net operating loss carryforwards for federal and state tax 101,900       116,000         101,900 116,000 130,000    
Operating loss carryforwards subject to expiration 74,300                 74,300        
Operating loss carryforwards not subject to expiration 27,600                 27,600        
Uncertain tax position liability 11,185       10,972         11,185 10,972 9,469   $ 18,447
Unrecognized tax benefits that would impact effective tax rate 10,900                 10,900        
Increase (decrease) in uncertain tax position                   200 1,500      
Income tax expense (benefit) 21,156 $ 24,873 $ 30,122 $ 24,059 (27,761) $ 42,119 $ 40,725 $ 34,967   100,210 90,050 189,203    
Company's accrued liability for interest and penalties related to income tax liabilities 1,100       $ 1,200         $ 1,100 1,200      
Interest and Penalties [Member]                            
Income Tax [Line Items]                            
Income tax expense (benefit)                     $ 200 $ 7,900    
Earliest Tax Year [Member]                            
Income Tax [Line Items]                            
Federal and state income tax examinations                   2014        
Latest Tax Year [Member]                            
Income Tax [Line Items]                            
Federal and state income tax examinations                     2017      
Internal Revenue Code Section 481 [Member]                            
Income Tax [Line Items]                            
Accounting method changes $ 105,300                 $ 105,300        
Scenario, Forecast [Member]                            
Income Tax [Line Items]                            
Increase (decrease) in uncertain tax position                 $ 200          
Minimum [Member]                            
Income Tax [Line Items]                            
Expiration period of operating loss carryforwards                   2019        
Maximum [Member]                            
Income Tax [Line Items]                            
Expiration period of operating loss carryforwards                   2038