Stockholders' Equity - Exchange Agreement (Details) shares in Millions		3 Months Ended
May 03, 2017	Mar. 31, 2019 shares
Limited Partners' Capital Account [Line Items]
Conversion ratio		1.25
Class B Common Stock
Limited Partners' Capital Account [Line Items]
Conversion ratio	0.8
Exchange Agreement
Limited Partners' Capital Account [Line Items]
Conversion of stock, converted (in shares)		2.5
LLC units received (in shares)		2.5
Exchange Agreement \| Class B Common Stock
Limited Partners' Capital Account [Line Items]
Conversion of stock, converted (in shares)		2.0
Exchange Agreement \| Class A Common Stock
Limited Partners' Capital Account [Line Items]
Conversion ratio	0.8
Conversion of stock, issued (in shares)		2.0

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586

Name:	us-gaap_ConversionOfStockSharesIssued1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration