Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenues		$ 105,283	$ 121,993	$ 103,105	$ 93,699	$ 105,282	$ 113,048	$ 96,026	$ 90,188	$ 424,080	$ 404,544	$ 408,122
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]									22,121	10,612	17,457
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues										209,512	184,284	161,575
Operating Segments [Member] | Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues										22,206	11,530	19,017
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues										$ 85	$ 918	$ 1,560

[1] Gross Enviroplex sales revenues were $22,206, $11,530 and $19,017 in 2016, 2015 and 2014, respectively, which includes inter-segment sales to Mobile Modular of $85, $918 and $1,560, which have been eliminated in consolidation.