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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, 2016 | Dec. 31, 2015
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 65,351 | $ 112,193
Tax credits | 25,173 | 40,614
Compensation | 39,340 | 25,752
Deferred revenue | 27,303 | 25,287
Other | 6,279 | 8,346
Gross deferred income tax assets | 163,446 | 212,192
Less: valuation allowance | (9,659) | (18,742)
Net deferred income tax assets | 153,787 | 193,450
Deferred income tax liabilities: |  |
Depreciation and amortization | (102,657) | (130,645)
Total deferred income tax liabilities | (102,657) | (130,645)
Net deferred income taxes | 51,130 | 62,805
Deferred income taxes / liabilities included in the balance sheet are: |  |
Deferred income tax asset-noncurrent | 77,479 | 90,872
Deferred income tax liability-noncurrent | (26,349) | (28,067)
Net deferred income taxes | $ 51,130 | $ 62,805

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