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Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
 [1]
Sep. 30, 2018
 [1]
Jun. 30, 2018
 [1]
Mar. 31, 2018
 [1]
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Revenues $ 798,476 $ 754,235 $ 889,053 $ 779,971 $ 749,994 $ 710,748 $ 751,195 $ 779,610 $ 3,221,735 [1] $ 2,991,547 $ 2,918,765
U.S. Operating Segment                      
Disaggregation of Revenue [Line Items]                      
Revenues [2]                 2,538,957    
International Operating Segment                      
Disaggregation of Revenue [Line Items]                      
Revenues                 682,778    
Goods and Services Transferred at a Point in Time                      
Disaggregation of Revenue [Line Items]                      
Revenues                 3,061,660    
Goods and Services Transferred at a Point in Time | U.S. Operating Segment                      
Disaggregation of Revenue [Line Items]                      
Revenues [2]                 2,453,313    
Goods and Services Transferred at a Point in Time | International Operating Segment                      
Disaggregation of Revenue [Line Items]                      
Revenues                 608,347    
Goods and Services Transferred Over Time                      
Disaggregation of Revenue [Line Items]                      
Revenues                 160,075    
Goods and Services Transferred Over Time | U.S. Operating Segment                      
Disaggregation of Revenue [Line Items]                      
Revenues [2]                 85,644    
Goods and Services Transferred Over Time | International Operating Segment                      
Disaggregation of Revenue [Line Items]                      
Revenues                 $ 74,431    
[1] See Note 3 for discussion of the adoption of ASC 606 and its impact on the income statement beginning in 2018.
[2] U.S. segment revenues include eliminations of intercompany transactions with the international operating segment. See Note 19 for additional information on intercompany eliminations.