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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, 2015 | Dec. 31, 2014
--- | --- | ---
Deferred income tax assets: |  |
Net operating loss carryforwards | $ 112,193 | $ 150,004
Tax credits | 40,614 | 43,804
Compensation | 25,752 | 24,486
Deferred revenue | 25,287 | 13,486
Tax basis in investments | 100 | 5,601
Other | 8,246 | 9,712
Gross deferred income tax assets | 212,192 | 247,093
Less: valuation allowance | (18,742) | (36,174)
Net deferred income tax assets | 193,450 | 210,919
Deferred income tax liabilities: |  |
Depreciation and amortization | (130,645) | (129,825)
Total deferred income tax liabilities | (130,645) | (129,825)
Net deferred income taxes | 62,805 | 81,094
Deferred income taxes / liabilities included in the balance sheet are: |  |
Deferred income tax asset - noncurrent | 90,872 | 94,536
Deferred income tax liability - noncurrent | (28,067) | (13,442)
Net deferred income taxes | $ 62,805 | $ 81,094

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