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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 | Dec. 31, 2011 Prior fiscal year | Dec. 31, 2011 Expiring in 2014 | Dec. 31, 2011 Expiring in 2015 | Dec. 31, 2011 Expire in 2016 | Dec. 31, 2011 Expire in 2018 | Dec. 31, 2011 Expire in 2028 | Dec. 31, 2011 Expiring in 2029 | Dec. 31, 2011 Expiring in 2030 | Dec. 31, 2011 Expire in 2031 | Dec. 31, 2011 U.S. | Dec. 31, 2011 U.S. Minimum | Dec. 31, 2011 U.S. Maximum | Dec. 31, 2011 Canada | Dec. 31, 2011 Canada Minimum | Dec. 31, 2011 Canada Maximum
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic Production Activities Deduction | 9.00% | 6.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other deferred tax assets |  |  | $ 29,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating losses carried forward |  |  | 118,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities that have not been provided on such unremitted foreign earnings for United States Federal or state income taxes |  |  | 25,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal net operating losses |  |  | 327,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating losses carried back to prior years |  |  | 136,000,000 | 11,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating losses carried forward |  |  |  |  | 9,600,000 | 12,900,000 | 8,200,000 | 2,400,000 | 15,300,000 | 59,800,000 | 35,700,000 | 426,000,000 |  |  |  |  |  |
Unrecognized tax benefits |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax periods open for examination |  |  |  |  |  |  |  |  |  |  |  |  | Tax years ended December 31, 2008 through December 31, 2010 |  |  | Tax years ended December 31, 2007 through December 31, 2010 |  |
Tax period open for examination |  |  |  |  |  |  |  |  |  |  |  |  |  | 2008 | 2010 |  | 2007 | 2010
Reduction in deferred tax liabilities due to statutory tax rates in Canada being lower than those in the United States | $ (5,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of the country of domicile in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43, 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 + Details
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- Definition The tax effect as of the balance sheet date of the amount of excess of tax deductions over gross income in a year which cannot be used on the tax return of a state or local jurisdiction in the current year but can be carried forward to reduce taxable income or income taxes payable in a future year, for which there must be sufficient tax-basis income to utilize a portion or all of the carryforward amount to realize the deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 43 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Section Appendix E -Paragraph 289 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 + Details
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