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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2012 U.S. | Dec. 31, 2012 U.S. Minimum | Dec. 31, 2012 U.S. Maximum | Dec. 31, 2012 Canada | Dec. 31, 2012 Canada Minimum | Dec. 31, 2012 Canada Maximum | Dec. 31, 2012 Federal Income Tax Expire in 2031 | Dec. 31, 2012 State and Local Jurisdiction Expiring in 2014 | Dec. 31, 2012 State and Local Jurisdiction Expire in 2015 | Dec. 31, 2012 State and Local Jurisdiction Expire in 2016 | Dec. 31, 2012 State and Local Jurisdiction Expire in 2028 | Dec. 31, 2012 State and Local Jurisdiction Expiring in 2029 | Dec. 31, 2012 State and Local Jurisdiction Expiring in 2030 | Dec. 31, 2012 State and Local Jurisdiction Expire in 2031
Income Taxes [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic Production Activities Deduction | 9.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other deferred tax assets |  | $ 35,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal net operating losses |  | 54,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
State net operating losses |  | 169,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net operating losses carried forward |  |  |  |  |  |  |  |  | 54,000,000 | 4,100,000 | 12,900,000 | 8,300,000 | 14,500,000 | 29,800,000 | 17,100,000 | 82,300,000
Unrecognized tax benefits |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax periods open for examination |  |  | Tax years ended December 31, 2009 through December 31, 2011 |  |  | Tax years ended December 31, 2008 through December 31, 2011 |  |  |  |  |  |  |  |  |  |
Tax period open for examination |  |  |  | 2009 | 2011 |  | 2008 | 2011 |  |  |  |  |  |  |  |
Reduction in deferred tax liabilities due to statutory tax rates in Canada being lower than those in the United States | (5,100,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities that have not been provided on such unremitted foreign earnings for United States Federal or state income taxes |  | 27,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized deferred tax liability associated with the indefinitely reinvested undistributed earnings |  | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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