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Summary of Significant Accounting Policies - Goodwill and Other Intangibles (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 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 | $ 1,937,045,000 | $ 1,603,169,000
Intangible assets | 275,018,000 | $ 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 | 72,200,000 |
Intangible assets | $ 11,500,000 |

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