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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Net income $ 4,828 $ 9,953 $ 6,501 $ 25,510
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation and amortization     3,870 8,540
Deferred taxes     (5,758) (3,654)
Changes in operating assets and liabilities:        
Prepaid expenses and other current assets     453 (992)
Deposits and other assets     (344) (275)
Accrued compensation and employee benefits     (3,015) (10,712)
Deferred revenue and advance payments     $ 10,502 11,058
As Reported        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Net income   11,076   25,943
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation and amortization       7,133
Deferred taxes       (4,015)
Changes in operating assets and liabilities:        
Prepaid expenses and other current assets       (699)
Deposits and other assets       (274)
Accrued compensation and employee benefits       (9,685)
Deferred revenue and advance payments       11,072
Effect of the Adoption | ASU 2014-09        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Net income   $ (1,123)   (433)
Adjustments to reconcile net income to net cash provided by operating activities:        
Depreciation and amortization       1,407
Deferred taxes       361
Changes in operating assets and liabilities:        
Prepaid expenses and other current assets       (293)
Deposits and other assets       (1)
Accrued compensation and employee benefits       (1,027)
Deferred revenue and advance payments       $ (14)