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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