Commitments and Contingencies - Additional Information (Details) $ in Millions	12 Months Ended
Dec. 31, 2016 USD ($) letter_of_credit	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Rent expenses incurred	$ 16.7	$ 12.9	$ 11.9
Number of letters of credit \| letter_of_credit	2
Standby Letters of Credit
Debt Instrument [Line Items]
Letters of credit available, amount	$ 17.8

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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