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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)

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