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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)

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