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Goodwill - Goodwill Activity (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Goodwill [Roll Forward]    
Goodwill, beginning of period $ 28,609 $ 56,811
Acquisition of a business 3,406 28,609
Changes to preliminary purchase price allocations 957  
Effect of movements in foreign exchange rates   3,932
Impairment losses   (60,743)
Goodwill, end of period 32,972 28,609
Modular – US    
Goodwill [Roll Forward]    
Goodwill, beginning of period 28,609 0
Acquisition of a business 3,406 28,609
Changes to preliminary purchase price allocations 957  
Effect of movements in foreign exchange rates   0
Impairment losses   0
Goodwill, end of period 32,972 28,609
Modular – Other North America    
Goodwill [Roll Forward]    
Goodwill, beginning of period 0 56,811
Acquisition of a business 0 0
Changes to preliminary purchase price allocations 0  
Effect of movements in foreign exchange rates   3,932
Impairment losses   (60,743)
Goodwill, end of period $ 0 $ 0