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Income Taxes - Deferred Tax Assets and Liabilities Result from Differences in Timing of Recognition of Certain Income and Expense Items for Tax and Financial Accounting Purposes (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 38,419 | $ 65,351
Tax credits | 37,305 | 25,173
Compensation | 18,124 | 39,340
Deferred revenue | 22,248 | 27,303
Other | 9,055 | 6,279
Gross deferred income tax assets | 125,151 | 163,446
Less: valuation allowance | (7,808) | (9,659)
Net deferred income tax assets | 117,343 | 153,787
Deferred income tax liabilities: |  |
Depreciation and amortization | (67,504) | (102,657)
Total deferred income tax liabilities | (67,504) | (102,657)
Net deferred income taxes | 49,839 | 51,130
Deferred income taxes / liabilities included in the balance sheet are: |  |
Deferred income tax asset - noncurrent | 66,749 | 77,479
Deferred income tax liability - noncurrent | (16,910) | (26,349)
Net deferred income taxes | $ 49,839 | $ 51,130

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