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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Net income | $ 1,673 | $ 15,557
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 3,298 | 4,491
Deferred taxes | (2,662) | (968)
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets | (3,783) | (270)
Deposits and other assets | 228 | 98
Accrued compensation and employee benefits | (8,085) | (11,296)
Deferred revenue and advance payments | $ 19,570 | 22,294
As Reported |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Net income |  | 14,867
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization |  | 3,818
Deferred taxes |  | (1,812)
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets |  | (58)
Deposits and other assets |  | 75
Accrued compensation and employee benefits |  | (10,795)
Deferred revenue and advance payments |  | 23,811
Effect of the Adoption | ASU 2014-09 |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Net income |  | 690
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization |  | 673
Deferred taxes |  | 844
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets |  | (212)
Deposits and other assets |  | 23
Accrued compensation and employee benefits |  | (501)
Deferred revenue and advance payments |  | $ (1,517)

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