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Summary of Significant Accounting Policies - Significant Customers (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
California
Segment Reporting Information [Line Items]
Percentage of revenues under contracts or subcontracts	13.00%	18.00%	21.00%
Texas
Segment Reporting Information [Line Items]
Percentage of revenues under contracts or subcontracts	10.00%	12.00%	13.00%

X

- Definition

Percentage of revenues under contracts or subcontracts.

+ References

No definition available.

+ Details

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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.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_TX
Namespace Prefix:
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Balance Type:
Period Type: