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Summary of Capital Expenditures Including Accrued Amounts (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |
Total capital expenditures | $ 114,747 | $ 134,531 | $ 415,441
Owned and managed |  |  |
Segment Reporting Information [Line Items] |  |  |
Total capital expenditures | 83,757 | 108,241 | 382,781
Managed-only |  |  |
Segment Reporting Information [Line Items] |  |  |
Total capital expenditures | 5,238 | 5,749 | 4,049
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Total capital expenditures | $ 25,752 | $ 20,541 | $ 28,611

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- Definition The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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