Summary of Significant Accounting Policies (Goodwill and Other Intangibles) - Additional Information (Detail) |
3 Months Ended | 12 Months Ended |
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Mar. 31, 2017
USD ($)
Divisions
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Dec. 31, 2016
USD ($)
Reporting_Unit
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| 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 | $ 1,608,384,000 | $ 1,603,169,000 |
| Intangible assets | 181,934,000 | $ 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 [Member] | ||
| Goodwill And Intangible Assets [Line Items] | ||
| Goodwill | 69,800,000 | |
| Intangible assets | $ 11,700,000 |
| X | ||||||||||
- Definition Decrease in fair value of Reporting units considered, for impairment calculation. No definition available.
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- Definition Goodwill and intangible assets. No definition available.
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- Definition Number of internal divisions. No definition available.
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- Definition Number of reporting units with fair values that approximated carrying values. No definition available.
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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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