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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Cash Flows (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, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                      
Net income $ 3,301 $ 12,699 $ 4,828 $ 1,673 $ (25,499) $ 18,184 $ 9,953 $ 15,557 $ 22,501 $ 18,195 $ 92,239
Adjustments to reconcile net income to net cash provided by operating activities:                      
Depreciation and amortization                 3,701 15,532 19,944
Deferred taxes                 (8,274) (3,605) (4,450)
Changes in operating assets and liabilities:                      
Prepaid expenses and other current assets                 (6,561) (4,739) (741)
Deposits and other assets                 (1,201) 3,029 (4,056)
Accrued compensation and employee benefits                 5,116 (6,209) 579
Deferred revenue and advance payments                 $ (22,126) (589) 9,691
As Reported | ASU 2014-09                      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                      
Net income                   17,643 90,908
Adjustments to reconcile net income to net cash provided by operating activities:                      
Depreciation and amortization                   12,572 17,195
Deferred taxes                   (2,011) (4,983)
Changes in operating assets and liabilities:                      
Prepaid expenses and other current assets                   (4,279) (880)
Deposits and other assets                   2,981 (4,059)
Accrued compensation and employee benefits                   (3,683) 3,787
Deferred revenue and advance payments                   (1,609) 11,238
Effect of the Adoption | ASU 2014-09                      
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]                      
Net income                   552 1,331
Adjustments to reconcile net income to net cash provided by operating activities:                      
Depreciation and amortization                   2,960 2,749
Deferred taxes                   (1,594) 533
Changes in operating assets and liabilities:                      
Prepaid expenses and other current assets                   (460) 139
Deposits and other assets                   48 3
Accrued compensation and employee benefits                   (2,526) (3,208)
Deferred revenue and advance payments                   $ 1,020 $ (1,547)