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Change in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 591,548	$ 168,764
Balance	615,568	591,548
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(6,363)	(13,744)
Other comprehensive income (loss)	(5,530)	7,381
Balance	(11,893)	(6,363)
Changes in Fair Value of Available-for-Sale Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance		(5)
Other comprehensive income (loss)		5
Balance
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(6,363)	(13,749)
Other comprehensive income (loss)	(5,530)	7,386
Balance	$ (11,893)	$ (6,363)

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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