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Indebtedness - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Short term debt		$ 0	$ 0
Senior secured credit facility, maturity date	Jun. 30, 2022
Revolving Credit Facility
Debt Instrument [Line Items]
Available borrowings capacity under credit agreement	$ 143,182,000
Maximum
Debt Instrument [Line Items]
Available borrowings capacity under credit agreement	$ 250,000,000
Consolidated funded debt ratio	325.00%
Maximum | Revolving Credit Facility
Debt Instrument [Line Items]
Capacity to increase borrowings under credit agreement		$ 137,047,000
Maximum | Term Loan
Debt Instrument [Line Items]
Accordion feature	$ 100,000,000
Minimum
Debt Instrument [Line Items]
Consolidated fixed charge covenant ratio	125.00%

X

- Definition

Consolidated funded debt ratio.

+ References

No definition available.

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- Definition

Line of credit consolidated fixed charge covenant ratio.

+ References

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- Definition

Line Of Credit Facility Maturity Date

+ References

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- Definition

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- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
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- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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-SubTopic 10
-Section S99
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-Section S99
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-Name Accounting Standards Codification
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