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Subsequent Event and Assets and Liabilities Held for Sale - Summary of Assets Held for Sale and Liabilities Held for Sale (Parenthetical) (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Long Lived Assets Held-for-sale [Line Items]
Accumulated depreciation on property and equipment	$ 87,956	$ 231,939
Asset Held For Sale [Member]
Long Lived Assets Held-for-sale [Line Items]
Accumulated depreciation on property and equipment	$ 166,066

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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