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Condensed Consolidating Statement of Cash Flows (Unaudited) (Detail) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | $ 284,571 | $ 264,135
Net cash used in investing activities | (230,636) | (81,760)
Net cash provided by (used in) financing activities | (1,390) | (177,351)
Net increase (decrease) in cash, cash equivalents and restricted cash | 52,545 | 5,024
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period | 52,183 | 37,711
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period | 104,728 | 42,735
Reportable Legal Entities | Parent |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | 255,765 | 239,662
Net cash used in investing activities | (178,280) | (50,216)
Net cash provided by (used in) financing activities | (34,631) | (180,702)
Net increase (decrease) in cash, cash equivalents and restricted cash | 42,854 | 8,744
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period | 25,745 | 11,378
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period | 68,599 | 20,122
Reportable Legal Entities | Combined Subsidiary Guarantors |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | 19,472 | 24,473
Net cash used in investing activities | (23,098) | (31,544)
Net cash provided by (used in) financing activities | 1,852 | 3,351
Net increase (decrease) in cash, cash equivalents and restricted cash | (1,774) | (3,720)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, beginning of period | 26,438 | 26,333
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period | 24,664 | $ 22,613
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash provided by operating activities | 9,334 |
Net cash used in investing activities | (124,178) |
Net cash provided by (used in) financing activities | 126,309 |
Net increase (decrease) in cash, cash equivalents and restricted cash | 11,465 |
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, end of period | 11,465 |
Consolidating Adjustments and Other |  |
Condensed Financial Statements, Captions [Line Items] |  |
Net cash used in investing activities | 94,920 |
Net cash provided by (used in) financing activities | $ (94,920) |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=98513485&loc=SL98516268-108586 + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 230 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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