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Summary of Revenues Disaggregated Based on Timing of Revenue Recognition (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue [Line Items]    
Total revenues $ 714,723 $ 779,971
U.S. Operating Segment    
Disaggregation of Revenue [Line Items]    
Total revenues [1] 554,816 596,343
International Operating Segment    
Disaggregation of Revenue [Line Items]    
Total revenues 159,907 $ 183,628
Goods and Services Transferred at a Point in Time    
Disaggregation of Revenue [Line Items]    
Total revenues 675,292  
Goods and Services Transferred at a Point in Time | U.S. Operating Segment    
Disaggregation of Revenue [Line Items]    
Total revenues [1] 532,183  
Goods and Services Transferred at a Point in Time | International Operating Segment    
Disaggregation of Revenue [Line Items]    
Total revenues 143,109  
Goods and Services Transferred Over Time    
Disaggregation of Revenue [Line Items]    
Total revenues 39,431  
Goods and Services Transferred Over Time | U.S. Operating Segment    
Disaggregation of Revenue [Line Items]    
Total revenues [1] 22,633  
Goods and Services Transferred Over Time | International Operating Segment    
Disaggregation of Revenue [Line Items]    
Total revenues $ 16,798  
[1] U.S. segment revenues include eliminations of intercompany transactions with the international operating segment. See Note 16 for additional information on intercompany eliminations.