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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, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 12,167 | $ 9,700 | $ 20,394 | $ (7,906) | $ 3,301 | $ 12,699 | $ 4,828 | $ 1,673 | $ 34,355 | $ 22,501 | $ 18,195
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 16,699 | 3,701 | 15,532
Deferred taxes |  |  |  |  |  |  |  |  | (2,614) | (8,274) | (3,605)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  | 6,415 | (6,561) | (4,739)
Deposits and other assets |  |  |  |  |  |  |  |  | 761 | (1,201) | 3,029
Accrued compensation and employee benefits |  |  |  |  |  |  |  |  | (2,658) | 5,116 | (6,209)
Deferred revenue and advance payments |  |  |  |  |  |  |  |  | $ 20,836 | $ (22,126) | (589)
As Reported | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 17,643
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 12,572
Deferred taxes |  |  |  |  |  |  |  |  |  |  | (2,011)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  | (4,279)
Deposits and other assets |  |  |  |  |  |  |  |  |  |  | 2,981
Accrued compensation and employee benefits |  |  |  |  |  |  |  |  |  |  | (3,683)
Deferred revenue and advance payments |  |  |  |  |  |  |  |  |  |  | (1,609)
Effect of the Adoption | ASU 2014-09 |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  |  | 552
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  | 2,960
Deferred taxes |  |  |  |  |  |  |  |  |  |  | (1,594)
Changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  | (460)
Deposits and other assets |  |  |  |  |  |  |  |  |  |  | 48
Accrued compensation and employee benefits |  |  |  |  |  |  |  |  |  |  | (2,526)
Deferred revenue and advance payments |  |  |  |  |  |  |  |  |  |  | $ 1,020

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