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Interim Consolidated Financial Statements - Summary of Effect of Adopting ASC 606 In Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 3,950	$ 3,953	$ 10,005	$ 13,047
Comprehensive income	3,413	$ 5,577	7,724	$ 17,999
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member]
Net income	3,136		10,980
Comprehensive income	$ 2,599		$ 8,698

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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