Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2017 USD ($) Segment	Jan. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of Reportable Segments \| Segment	4
NMS
Summary Of Significant Accounting Policies [Line Items]
Unrecognized tax benefits \| $	$ 5.3	$ 5.3

Amount of unrecognized tax benefits.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

Name:	us-gaap_UnrecognizedTaxBenefits
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant