Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items]    
Liability for deferred lease expenses $ 40,929 $ 42,378
Employer matching contribution payments 6,380 $ 3,187
Liability recorded for employer contribution payments $ 999  
Tim Warner    
Commitments and Contingencies Disclosure [Line Items]    
Employment agreement termination date Apr. 01, 2016  
Other Employees Except Tim Warner    
Commitments and Contingencies Disclosure [Line Items]    
Employment agreements term extension 1 year  
Minimum    
Commitments and Contingencies Disclosure [Line Items]    
Operating and capital leases with terms generally ranging 10 years  
Maximum    
Commitments and Contingencies Disclosure [Line Items]    
Operating and capital leases with terms generally ranging 25 years