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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		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 7,788	$ 6,064	$ 6,055	$ 9,094
Comprehensive income	4,456	$ 8,585	4,311	$ 12,422
ASC 606 [Member] | Amounts as if Previous Guidance in Effect [Member]
Net income	8,053		7,844
Comprehensive income	$ 4,721		$ 6,100

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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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