Acquisitions - Additional Information - 2014 Acquisitions (Detail)											12 Months Ended
	Apr. 07, 2014 USD ($) $ / shares shares	Dec. 20, 2013 USD ($)	Nov. 07, 2013 USD ($)	Oct. 31, 2013 USD ($)	Oct. 31, 2013 AUD	Sep. 10, 2013 USD ($)	Sep. 10, 2013 AUD	Sep. 06, 2013 USD ($)	Sep. 06, 2013 CAD	Aug. 01, 2013 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Oct. 31, 2013 AUD	Sep. 10, 2013 AUD	Sep. 06, 2013 CAD
Business Acquisition [Line Items]
Business acquisition cost holdback	$ 7,937,000										$ 1,849,000	$ 1,126,000	$ 3,152,000
Amount payable under purchase consideration											$ 2,310,000		$ 3,203,000
Business acquisition cost holdback note discounted	9,616,000
Line of credit borrowings												25,000,000
Lone Star [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross	75,000,000
Total purchase consideration	102,418,000
Effective date of acquisition											Apr. 01, 2014
Purchase consideration, value of common stock issued	$ 9,865,000
Issuance of common stock for business acquisition | shares	1,230,012
Purchase consideration, common stock price per share | $ / shares	$ 8.13
Revenues since date of acquisition												14,658,000
Net income since date of acquisition												$ 1,990,000
Lone Star [Member] | Amended Wells Fargo Credit Facility [Member]
Business Acquisition [Line Items]
Line of credit borrowings	$ 50,000,000
Lone Star [Member] | Credit Suisse [Member]
Business Acquisition [Line Items]
Line of credit borrowings	25,000,000
Lone Star [Member] | General indemnity holdback [Member]
Business Acquisition [Line Items]
Amount payable under purchase consideration	5,000,000
Business acquisition cost holdback note discounted	$ 4,243,000
Purchase consideration payable term	2 years
Lone Star [Member] | Non-Compete Agreements [Member]
Business Acquisition [Line Items]
Amount payable under purchase consideration	$ 5,000,000
Business acquisition cost holdback note discounted	$ 3,694,000
Purchase consideration payable term	5 years
Lone Star [Member] | Working Capital And Other Adjustments [Member]
Business Acquisition [Line Items]
Amount payable under purchase consideration	$ 10,481,000
Business acquisition cost holdback note discounted	$ 9,616,000
Harper Hot Shot Service, Inc. [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross										$ 3,267,000
Business acquisition cost holdback										$ 148,000
Canadian Storage Containers Inc. [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross								$ 1,527,000	CAD 1,602,000
Business acquisition cost holdback								$ 258,000								CAD 271,000
Intermodal Kookaburra [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross						$ 5,231,000	AUD 5,680,000
Business acquisition cost holdback						$ 368,000									AUD 400,000
DBCS [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross				$ 333,000	AUD 351,000
Business acquisition cost holdback				$ 33,000										AUD 35,000
Pinnacle Rental & Supply, LLC [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross			$ 6,179,000
Business acquisition cost holdback			$ 293,000
Rumpke [Member]
Business Acquisition [Line Items]
Payments to acquire businesses, gross		$ 284,000
Business acquisition cost holdback		$ 26,000