Entity Address, State or Province Entity Address, State or Province Entity Tax Identification Number Entity Tax Identification Number Title of 12(b) Security Title of 12(b) Security Entity File Number Entity File Number Written Communications Written Communications Entity Emerging Growth Company Entity Emerging Growth Company Soliciting Material Soliciting Material City Area Code City Area Code Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Address, Address Line One Entity Address, Address Line One Entity Information [Line Items] Entity Information [Line Items] Entity Address, Address Line Two Entity Address, Address Line Two Local Phone Number Local Phone Number Cover page. Cover [Abstract] Pre-commencement Tender Offer Pre-commencement Tender Offer Amendment Flag Amendment Flag Pre-commencement Issuer Tender Offer Pre-commencement Issuer Tender Offer Trading Symbol Trading Symbol Document Period End Date Document Period End Date Class of Stock [Domain] Class of Stock [Domain] Common Class A [Member] Common Class A [Member] Document Type Document Type Class of Stock [Axis] Class of Stock [Axis] Entity Registrant Name Entity Registrant Name Entity Address, City or Town Entity Address, City or Town Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entities [Table] Entities [Table] Entity Central Index Key Entity Central Index Key Common Class C [Member] Common Class C [Member] Security Exchange Name Security Exchange Name