Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Additional Information (Detail) |
6 Months Ended |
|---|---|
Jun. 30, 2018 | |
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |
| Percentage of guaranteed subsidiaries by the parent companies | 100.00% |
| X | ||||||||||
- Definition Percentage of ownership interest in guarantor subsidiaries by parent companies. No definition available.
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| X | ||||||||||
- References No definition available.
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