Income Taxes - Additional Information (Detail) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($)
Income Tax Disclosure [Abstract]
Increase in income tax expense benefit	$ 0.4
Increase in foreign tax expense related to change in our jurisdictional mix of earnings and uncertain tax positions	$ 0.4

Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(1))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration