Acquisition and Investment - PM Group Acquisition - Schedule of Restated Purchase Price Allocations (Detail)
€ in Thousands, $ in Thousands
Dec. 31, 2015
USD ($)
Jan. 15, 2015
USD ($)
Jan. 15, 2015
EUR (€)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]          
Goodwill $ 80,089 $ 30,173   $ 52,666 $ 22,489
PM Group [Member]          
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]          
Goodwill   30,173 € 25,528    
Accounts receivable   22,215 18,795    
Fixed assets   16,952 14,342    
Adjustments to deferred tax assets to reflect corrected value   10,867 9,195    
Assumed non-recourse debt   (61,853) € (52,332)    
PM Group [Member] | Provisional Amount [Member]          
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]          
Goodwill   31,052      
Accounts receivable   22,475      
Fixed assets   17,344      
Adjustments to deferred tax assets to reflect corrected value   9,680      
Assumed non-recourse debt   (62,197)      
PM Group [Member] | Adjustment Based On Review Of Purchase Price Allocation          
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]          
Goodwill (879) (879)      
Accounts receivable (260) (260)      
Fixed assets (392) (392)      
Adjustments to deferred tax assets to reflect corrected value (1,187) 1,187      
Assumed non-recourse debt $ 344 344      
PM Group [Member] | Revised Provisional Amount [Member]          
Schedule Of Business Acquisitions Purchase Price Allocation [Line Items]          
Goodwill   30,173      
Accounts receivable   22,215      
Fixed assets   16,952      
Adjustments to deferred tax assets to reflect corrected value   10,867      
Assumed non-recourse debt   $ (61,853)