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Recent Accounting Standards - Line Items Adjusted in Consolidated Statement of Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net income	$ 1,673	$ 15,557
Foreign currency translation adjustment	1,440	1,048
Comprehensive income	$ 3,113	16,575
As Reported
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net income		14,867
Foreign currency translation adjustment		812
Comprehensive income		15,649
Effect of the Adoption | ASU 2014-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net income		690
Foreign currency translation adjustment		236
Comprehensive income		$ 926

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- Definition

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.

+ References

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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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