Label	Element	Value
Common Class B [Member]
CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 0
Additional Paid In Capital [Member]
CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Common Class A [Member]
CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Retained Earnings [Member]
CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 4,719,000