Leases - summarizes the Company's operating leases (Detail)	6 Months Ended
	Jun. 30, 2019
Office space [Member]
Operating lease:
Renewal Option	Yes
Office space [Member] | Maximum [Member]
Operating lease:
Initial Term	3 years
Office space [Member] | Minimum [Member]
Operating lease:
Initial Term	1 year
Retail space [Member]
Operating lease:
Renewal Option	Yes
Retail space [Member] | Maximum [Member]
Operating lease:
Initial Term	20 years
Retail space [Member] | Minimum [Member]
Operating lease:
Initial Term	3 years
Boat docks/wet slips [Member]
Operating lease:
Renewal Option	Yes
Boat docks/wet slips [Member] | Maximum [Member]
Operating lease:
Initial Term	12 months
Boat docks/wet slips [Member] | Minimum [Member]
Operating lease:
Initial Term	1 month