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Recent Accounting Standards - Line Items Adjusted 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
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net income	$ 4,828	$ 9,953	$ 6,501	$ 25,510
Foreign currency translation adjustment	(3,892)	2,257	(2,452)	3,305
Comprehensive income	$ 936	12,210	$ 4,049	28,785
As Reported
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net income		11,076		25,943
Foreign currency translation adjustment		2,218		3,030
Comprehensive income		13,294		28,943
Effect of the Adoption | ASU 2014-09
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Net income		(1,123)		(433)
Foreign currency translation adjustment		39		275
Comprehensive income		$ (1,084)		$ (158)

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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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