Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Goodwill and Other Intangibles (Detail)

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Summary of Significant Accounting Policies - Goodwill and Other Intangibles (Detail)
6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
Divisions
Dec. 31, 2016
USD ($)
Reporting_Unit
Goodwill And Intangible Assets [Line Items]    
Number of internal divisions | Divisions 2  
Decrease in fair value of reporting units considered for impairment calculation   10.00%
Number of reporting units with fair values that approximated carrying values | Reporting_Unit   2
Goodwill $ 1,616,317,000 $ 1,603,169,000
Intangible assets 184,375,000 $ 187,023,000
Non-cash charge for impairment of goodwill 0  
Oil and Gas Infrastructure Division, Operating Units that have been Negatively Impacted by Various Factors    
Goodwill And Intangible Assets [Line Items]    
Goodwill 70,700,000  
Intangible assets $ 11,500,000