Fair Value Measurements - Additional Information (Details) - Level 3 [Member] |
3 Months Ended | 12 Months Ended |
|---|---|---|
Mar. 31, 2018 |
Dec. 31, 2017 |
|
| Fair Value, Option, Qualitative Disclosures Related to Election [Line Items] | ||
| Fair value interest rate spreads, minimum | 1.00% | 1.00% |
| Fair value interest rate spreads, maximum | 4.00% | 4.00% |
| X | ||||||||||
- Definition Fair Value Interest Rate Spreads Maximum No definition available.
|
| X | ||||||||||
- Definition Fair Value Interest Rate Spreads Minimum No definition available.
|
| 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. No definition available.
|
| X | ||||||||||
- Details
|