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Income Taxes - Schedule of Reconciliation of Federal Statutory Rate to Effective Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Tax Disclosure [Abstract] |  |  |
Statutory federal tax rate | (34.00%) | (34.00%) | 35.00%
State income taxes, net of federal income tax benefit | 1.10% | (9.40%) | 3.40%
Tax credits | (8.10%) | 0.60% | (4.00%)
U.S. manufacturing deduction | 1.70% | (3.80%) | (2.00%)
Permanent items | 0.60% | 2.20% | 0.50%
Book income attributable to noncontrolling interest | 0.40% | 6.80% | (1.40%)
Foreign rate differential and deferred items | (0.20%) | 0.10% | 0.60%
Increase (decrease) in tax reserves | (0.10%) | 0.30% | 0.60%
Increase in valuation allowance | 53.30% | 84.50% |
Other | 0.10% | (0.70%) | 1.00%
Effective income tax rate | 14.80% | 46.60% | 33.70%

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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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