Investment in Unconsolidated Joint Ventures - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Aug. 29, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Jan. 04, 2016	Feb. 12, 2015
Schedule of Equity Method Investments [Line Items]
Equity in income from unconsolidated joint ventures		$ 2,605	$ 4,089	$ 4,578
Adjustment depreciation		1,300	1,100	900
Distributions, including those in excess of basis		5,900	3,700	5,900
Distributions in excess of basis			1,400
Investments in unconsolidated joint ventures		19,369	17,741
Voyager Investments
Schedule of Equity Method Investments [Line Items]
Proceeds from distributions	$ 4,100
Other Regions | Other Investments
Schedule of Equity Method Investments [Line Items]
Equity in income from unconsolidated joint ventures		0	0	25
Investments in unconsolidated joint ventures		0	0
Other Regions | ECHO Financing
Schedule of Equity Method Investments [Line Items]
Equity in income from unconsolidated joint ventures		(75)	65	103
Investments in unconsolidated joint ventures		15,427	10,367
Arizona | Voyager Investments
Schedule of Equity Method Investments [Line Items]
Equity in income from unconsolidated joint ventures		1,014	846	$ 806
Proceeds from loans	$ 8,500
Investments in unconsolidated joint ventures		$ 3,376	$ 7,166
ECHO Financing | Other Regions
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures					$ 5,000	$ 4,000