Parent, Guarantor, Non-Guarantor Unaudited Consolidating Condensed Financial Statements - Additional Information (Detail) |
12 Months Ended |
|---|---|
Dec. 31, 2017 | |
| 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.
|
| X | ||||||||||
- References No definition available.
|