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Acquisitions - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Sep. 26, 2017
Jan. 06, 2017
Sep. 01, 2016
Oct. 01, 2015
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]                    
Business acquisition cash purchase price               $ 186,932,000 $ 10,297,000 $ 44,221,000
Goodwill         $ 131,431,000   $ 62,645,000 131,431,000 62,645,000  
Amortization expense               16,812,000 10,637,000 11,308,000
Reduction in goodwill balance due to adjustment in purchase price allocation           $ 945,000   0    
Goodwill recorded in acquisition               68,786,000 6,450,000  
North America Segment [Member]                    
Business Acquisition [Line Items]                    
Goodwill         119,828,000   55,688,000 119,828,000 55,688,000  
Amortization expense               $ 15,971,000 8,139,000 8,053,000
Business acquisition, effective date of acquisition               Jan. 06, 2017    
Goodwill recorded in acquisition               $ 64,140,000    
Acquisitions purchase price adjustment                 507,000  
APAC Segment [Member]                    
Business Acquisition [Line Items]                    
Goodwill         7,562,000   6,957,000 7,562,000 6,957,000  
Amortization expense               768,000 $ 547,000 421,000
Business acquisition, effective date of acquisition                 Sep. 01, 2016  
Working capital adjustment               35,000    
Goodwill recorded in acquisition               605,000 $ 6,957,000  
EMEA Segment [Member]                    
Business Acquisition [Line Items]                    
Goodwill         4,041,000     4,041,000    
Amortization expense               $ 73,000 1,951,000 $ 2,834,000
Business acquisition, effective date of acquisition               Sep. 26, 2017    
Goodwill recorded in acquisition               $ 4,041,000    
Caase Group, B.V. [Member]                    
Business Acquisition [Line Items]                    
Business acquisition cash purchase price $ 6,038,000                  
Caase Group, B.V. [Member] | EMEA Segment [Member]                    
Business Acquisition [Line Items]                    
Business acquisition cash purchase price 6,038,000                  
Net assets acquired 2,107,000                  
Cash acquired 68,000                  
Acquired identifiable intangible assets 2,039,000                  
Decrease in fair value of acquired identifiable intangible assets         193,000          
Goodwill         $ 4,041,000     4,041,000    
Caase Group, B.V. [Member] | EMEA Segment [Member] | Scenario, Previously Reported [Member]                    
Business Acquisition [Line Items]                    
Goodwill $ 4,117,000                  
Caase Group, B.V. [Member] | Customer Relationships [Member] | EMEA Segment [Member]                    
Business Acquisition [Line Items]                    
Estimated useful life of acquired intangible assets 8 years                  
Caase Group, B.V. [Member] | Trade Name [Member] | EMEA Segment [Member]                    
Business Acquisition [Line Items]                    
Estimated useful life of acquired intangible assets 8 years                  
Caase Group, B.V. [Member] | Non-compete Agreements [Member] | EMEA Segment [Member]                    
Business Acquisition [Line Items]                    
Estimated useful life of acquired intangible assets 8 years                  
Datalink [Member]                    
Business Acquisition [Line Items]                    
Business acquisition cash purchase price   $ 257,456,000                
Cash acquired   76,597,000                
Goodwill   64,140,000                
Estimated fair value of deferred revenue   65,500,000                
Estimated fair value of deferred costs   48,029,000                
Identified intangible assets   94,500,000                
Amortization expense               11,520,000    
Business combination, net sales from acquired entity               524,281,000    
Business combination, gross profit from acquired entity               $ 118,917,000    
Datalink [Member] | North America Segment [Member]                    
Business Acquisition [Line Items]                    
Goodwill   64,140,000                
Datalink [Member] | Customer Relationships [Member]                    
Business Acquisition [Line Items]                    
Identified intangible assets   92,200,000                
Datalink [Member] | Trade Name [Member]                    
Business Acquisition [Line Items]                    
Identified intangible assets   2,200,000                
Datalink [Member] | Non-compete Agreements [Member]                    
Business Acquisition [Line Items]                    
Identified intangible assets   $ 100,000                
Ignia Pty Ltd [Member]                    
Business Acquisition [Line Items]                    
Business acquisition cash purchase price     $ 10,804,000              
Business acquisition, effective date of acquisition               Sep. 01, 2016    
Ignia Pty Ltd [Member] | APAC Segment [Member]                    
Business Acquisition [Line Items]                    
Business acquisition cash purchase price     10,804,000              
Net assets acquired     5,324,000              
Cash acquired     1,463,000              
Acquired identifiable intangible assets     4,716,000              
Decrease in fair value of acquired identifiable intangible assets             218,000      
Goodwill             $ 6,957,000   6,957,000  
Business acquisition, effective date of acquisition               Sep. 01, 2016    
Working capital adjustment           $ 35,000        
Ignia Pty Ltd [Member] | APAC Segment [Member] | Scenario, Previously Reported [Member]                    
Business Acquisition [Line Items]                    
Goodwill     $ 7,248,000              
Ignia Pty Ltd [Member] | Customer Relationships [Member] | APAC Segment [Member]                    
Business Acquisition [Line Items]                    
Estimated useful life of acquired intangible assets     8 years              
Ignia Pty Ltd [Member] | Restrictive Covenant Agreements [Member] | APAC Segment [Member]                    
Business Acquisition [Line Items]                    
Estimated useful life of acquired intangible assets     27 months              
BlueMetal Architects, Inc. [Member]                    
Business Acquisition [Line Items]                    
Business acquisition cash purchase price       $ 44,221,000            
Net assets acquired       15,412,000            
Acquired identifiable intangible assets       15,240,000            
Business acquisition, effective date of acquisition                   Oct. 01, 2015
Goodwill recorded in acquisition                   $ 29,938,000
Tax deductible goodwill       $ 0            
BlueMetal Architects, Inc. [Member] | North America Segment [Member]                    
Business Acquisition [Line Items]                    
Acquisitions purchase price adjustment                 $ 507,000  
BlueMetal Architects, Inc. [Member] | Customer Relationships [Member]                    
Business Acquisition [Line Items]                    
Estimated useful life of acquired intangible assets       8 years            
BlueMetal Architects, Inc. [Member] | Restrictive Covenant Agreements [Member]                    
Business Acquisition [Line Items]                    
Estimated useful life of acquired intangible assets       3 years