Related Party Transactions (Details) - NSP China - Subsidiaries - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
Dec. 31, 2018 |
|
| Related Party Transaction [Line Items] | |||||
| Notes receivable, related parties, current | $ 6,000,000.0 | $ 6,000,000.0 | $ 6,000,000.0 | ||
| Company's Joint Venture Partner | |||||
| Related Party Transaction [Line Items] | |||||
| Notes receivable, related parties, current | 1,500,000 | 1,500,000 | $ 1,500,000 | ||
| Notes Receivable | |||||
| Related Party Transaction [Line Items] | |||||
| Related party transaction, amount | 0 | $ 2,000,000.0 | $ 0 | $ 4,000,000.0 | |
| Related party transaction, rate | 3.00% | ||||
| Notes Receivable | Company's Joint Venture Partner | |||||
| Related Party Transaction [Line Items] | |||||
| Related party transaction, amount | $ 0 | $ 500,000 | $ 0 | $ 1,000,000.0 | |
| X | ||||||||||
- Definition Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due within 1 year (or 1 business cycle). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of transactions with related party during the financial reporting period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| 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 | ||||||||||
- Definition Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|