Long-Term Debt, Net - Additional Information (Details)	6 Months Ended
Jun. 30, 2019 USD ($) SeriesNote	Dec. 31, 2014 USD ($) instrument
Debt Instrument [Line Items]
Financing lease obligations	$ 0
Number of series of debt issued \| SeriesNote	2
Maturity date	Jun. 19, 2023
Current borrowing capacity	$ 300,000,000
Uncommitted borrowings available	100,000,000
Maximum borrowing capacity	$ 400,000,000
Basis spread on variable rate	1.375%
Performance bonds under credit facility	$ 20,100,000
Remaining borrowing capacity	137,900,000
Performance bonds	$ 12,800,000
Interest Rate Swap [Member]
Debt Instrument [Line Items]
Derivative, number of instruments held \| instrument		2
Derivative, notional amount		$ 50,000,000
Credit Facility [Member]
Debt Instrument [Line Items]
Interest coverage ratio, minimum	3.00%
Covenant leverage ratio, minimum	2.50%
Senior Notes [Member]
Debt Instrument [Line Items]
Face amount	$ 150,000,000
Senior Notes Series A [Member]
Debt Instrument [Line Items]
Face amount	$ 75,000,000
Interest rate, effective percentage	4.01%
Maturity date	Sep. 30, 2021
Senior Notes Series B [Member]
Debt Instrument [Line Items]
Face amount	$ 75,000,000
Interest rate, effective percentage	4.11%
Maturity date	Sep. 30, 2023
Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	2.00%

Debt Instrument, Covenant, Interest Coverage Ratio, Minimum

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Debt Instrument, Covenant, Leverage Ratio, Maximum

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- Definition

Debt Instrument, Number of Series of Debt Issued

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Line of credit facility, extension capacity.

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- Definition

Performance bonds not under the credit facility.

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No definition available.

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Performance bonds under credit facility

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- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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No definition available.

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

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No definition available.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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- Definition

The number of derivative instruments of a particular group held by the entity.

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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