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Fair Value of Financial Instruments - Changes in Fair Value of Swaps (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (decrease) in fair value:
Recognized in earnings	$ (3)	$ 70	$ (6)
Recognized in other comprehensive income	594	812	678
Total	$ 591	$ 882	$ 672

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- Definition

Changes in Fair Value [Abstract]

+ References

No definition available.

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- Definition

Increase / (decrease) in fair value of interest rate swaps, net.

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- Definition

Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
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-URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580

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