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Discontinued Operations (Details)
 3 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Jun. 30, 2013
USD ($)
Jun. 30, 2012
USD ($)
Dec. 31, 2012
USD ($)
Mar. 31, 2013
Venezuela
USD ($)
Feb. 28, 2013
Venezuela
USD ($)
Aug. 31, 2012
Venezuela
USD ($)
Jun. 30, 2013
Venezuela
USD ($)
Jun. 30, 2012
Venezuela
USD ($)
Jun. 30, 2013
Venezuela
USD ($)
Jun. 30, 2012
Venezuela
USD ($)
Dec. 31, 2012
Venezuela
USD ($)
Feb. 28, 2013
Venezuela
VEB
Dec. 31, 2012
Venezuela
VEB
Jun. 30, 2013
Canada
USD ($)
Jun. 30, 2012
Canada
USD ($)
Jun. 30, 2013
Canada
USD ($)
Jun. 30, 2012
Canada
USD ($)
Dec. 31, 2012
Canada
USD ($)
Discontinued Operations                                        
Sale price of expropriated assets               $ 441,700,000                        
Initial payment received from sale of expropriated assets               176,700,000                        
Remitted amount               50,000,000                        
Installment payments received from sale of expropriated assets           34,300,000             16,800,000              
Prepayment of second quarter installment payment received           17,200,000                            
Remaining expected proceeds from sale of expropriated assets                     215,000,000                  
Translation gain             1,400,000                          
Exchange rate used for remeasurement of net liabilities                           6.3 4.3          
Impairment charges                               3,900,000 40,800,000 6,000,000 40,800,000  
Summary of operating results of the discontinued operations                                        
Revenue 13,630,000 13,966,000 24,458,000 25,240,000                       13,630,000 13,966,000 24,458,000 25,240,000  
Expenses and selling, general and administrative 10,852,000 14,097,000 22,118,000 28,120,000         81,000 271,000 308,000 443,000       10,771,000 13,826,000 21,810,000 27,677,000  
Loss (recovery) attributable to expropriation and impairments 3,696,000 42,381,000 (27,427,000) 42,394,000         (228,000) 1,568,000 (33,427,000) 1,581,000       3,924,000 40,813,000 6,000,000 40,813,000  
Other (income) loss, net 478,000 860,000 (2,080,000) 174,000             (2,592,000)         478,000 860,000 512,000 174,000  
Provision for (benefit from) income taxes 179,000 (481,000) 172,000 (1,395,000)           823,000   1,263,000       179,000 (1,304,000) 172,000 (2,658,000)  
Income (loss) from discontinued operations, net of tax (1,575,000) (42,891,000) 31,675,000 (44,053,000)         147,000 (2,662,000) 35,711,000 (3,287,000)       (1,722,000) (40,229,000) (4,036,000) (40,766,000)  
Summary of balance sheet data for discontinued operations                                        
Cash 107,000   107,000   904,000       98,000   98,000   113,000     9,000   9,000   791,000
Accounts receivable 10,742,000   10,742,000   9,165,000       2,000   2,000   17,000     10,740,000   10,740,000   9,148,000
Inventory 10,556,000   10,556,000   9,826,000                     10,556,000   10,556,000   9,826,000
Other current assets 1,885,000   1,885,000   1,851,000       12,000   12,000   41,000     1,873,000   1,873,000   1,810,000
Total current assets associated with discontinued operations 23,290,000   23,290,000   21,746,000       112,000   112,000   171,000     23,178,000   23,178,000   21,575,000
Total assets associated with discontinued operations 23,290,000   23,290,000   21,746,000       112,000   112,000   171,000     23,178,000   23,178,000   21,575,000
Accounts payable 4,402,000   4,402,000   3,844,000       367,000   367,000   499,000     4,035,000   4,035,000   3,345,000
Accrued liabilities 4,833,000   4,833,000   7,059,000       1,995,000   1,995,000   4,335,000     2,838,000   2,838,000   2,724,000
Deferred revenues 422,000   422,000   669,000                     422,000   422,000   669,000
Total current liabilities associated with discontinued operations 9,657,000   9,657,000   11,572,000       2,362,000   2,362,000   4,834,000     7,295,000   7,295,000   6,738,000
Other long-term liabilities 938,000   938,000   1,044,000       368,000   368,000   455,000     570,000   570,000   589,000
Total liabilities associated with discontinued operations $ 10,595,000   $ 10,595,000   $ 12,616,000       $ 2,730,000   $ 2,730,000   $ 5,289,000     $ 7,865,000   $ 7,865,000   $ 7,327,000