Income Taxes - Tax Provisions Reconciled to Recorded Provision (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Provision for income taxes before discrete items	$ 4,457	$ 1,571	$ 1,037	$ 2,653
Interest related to unrecognized tax benefits	113	64	225	99
Provision for (benefit from) stock based compensation, including ESPP dispositions	49	(771)	26	(2,339)
Benefit from reversals of uncertain tax positions	(46)	0	(233)	0
Provision for (benefit from) reassessment of taxes upon filing tax returns	(41)	157	(41)	72
Provision for (benefit from) reassessment of taxes upon tax law change	0	0	161	(481)
Provision for deemed repatriation transition tax	0	0	1,222	0
Provision for income taxes	$ 4,532	$ 1,021	$ 2,397	$ 4

Income tax reconciliation benefit from reassessment of taxes upon tax law change.

No definition available.

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- Definition

Income tax reconciliation benefit from reversal of accrued interest related to uncertain tax positions.

+ References

No definition available.

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- Definition

Income tax reconciliation nondeductible expense share based compensation cost and employee stock purchase plan dispositions.

+ References

No definition available.

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- Definition

Income tax reconciliation provision for deemed repatriation transition tax.

+ References

No definition available.

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- Definition

Provision For Benefit From Income Taxes Before Discrete Items

+ References

No definition available.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 20
-Section 45
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to revisions of previously reported income tax expense (benefit).

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- Definition

Amount of interest expense for an underpayment of income taxes.

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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