Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues		$ 105,282	$ 113,048	$ 96,026	$ 90,188	$ 111,792	$ 113,025	$ 95,745	$ 87,560	$ 404,544	$ 408,122	$ 379,509
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]									10,612	17,457	17,855
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues										184,284	161,575	132,661
Operating Segments [Member] | Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues										11,530	19,017	17,859
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues										$ 918	$ 1,560	$ 4

[1] Gross Enviroplex sales revenues were $11,530, $19,017 and $17,859 in 2015, 2014 and 2013, respectively, which includes inter-segment sales to Mobile Modular of $918, $1,560 and $4, which have been eliminated in consolidation.