Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
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3 Months Ended |
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Mar. 31, 2017 |
Jan. 01, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
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| Restricted Cash |
$ 13,000,000
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$ 9,000,000
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| Accounting Standards Update 2017-07 [Member] | Cost of Sales [Member] |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
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| New Accounting Pronouncement, Effect of Adoption, Quantification |
1,000,000
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| Accounting Standards Update 2017-07 [Member] | Selling, General and Administrative Expenses [Member] |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
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| New Accounting Pronouncement, Effect of Adoption, Quantification |
1,000,000
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| Accounting Standards Update 2016-18 [Member] |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
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| New Accounting Pronouncement, Effect of Adoption, Quantification |
$ 4,000,000
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| Accounting Standards Update 2016-01 [Member] |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
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| Impact on retained earnings |
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$ 2,000,000
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| Accounting Standards Update 2014-09 [Member] |
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| New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
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| Impact on retained earnings |
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$ 0
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