Aggregate dividends declared during the period for each share of common stock outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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

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Incremental percentage increase (decrease) in the stated rate on a debt instrument.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585

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Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Feb. 01, 2018	Jan. 23, 2018	Jan. 22, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Cash dividends declared per share (in dollars per share)				$ 0.8	$ 0.8	$ 0.80
Outstanding debt paid down				$ 6,000	$ 0	$ 0
Subsequent Event
Subsequent Event [Line Items]
Cash dividends declared per share (in dollars per share)	$ 0.20
Subsequent Event \| Credit Agreement \| Term B Loan Facility
Subsequent Event [Line Items]
Reduction in borrowing rate			0.75%
Outstanding debt paid down		$ 100,000	$ 100,000
Third party cost incurred		$ 1,100	$ 1,100
Subsequent Event \| Credit Agreement \| Term B Loan Facility \| London Interbank Offered Rate (LIBOR)
Subsequent Event [Line Items]
Debt instrument, basis spread on variable rate			2.50%