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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Federal statutory rate | (35.00%) | (35.00%) | (35.00%)
Adjustments for tax effects of: |  |  |
State taxes, net | (0.30%) | (1.10%) | (0.10%)
Stock-based compensation | 0.30% | 6.20% | 0.50%
Foreign taxes | 0.20% | 3.40% | 1.10%
Tax credits | (0.30%) | (3.30%) | (0.40%)
Deemed foreign dividend | 0.10% | (0.00%) | (0.00%)
Fair market value adjustments | (1.60%) | (7.60%) | 0.00%
Intercompany debt forgiveness and other permanent adjustments | 0.60% | 3.10% | 9.50%
Goodwill impairment | 29.10% | 0.00% | 0.00%
Tax rate adjustment | 0.40% | 0.40% | 0.20%
Uncertain tax positions | (0.10%) | 5.30% | 2.70%
Other | 3.10% | 0.20% | (0.40%)
Valuation allowance | 3.80% | 37.50% | 25.90%
Effective income tax rate | 0.30% | 9.10% | 4.00%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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