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Acquisitions - Narrative (Detail) (USD $)
12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 11 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 38 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Minimum [Member]
Jan. 31, 2012
Minimum [Member]
Jan. 31, 2013
Maximum [Member]
Jan. 31, 2012
Maximum [Member]
Jan. 31, 2013
Fursol [Member]
Oct. 04, 2012
Fursol [Member]
Jan. 31, 2013
Fursol [Member]
Computer Software [Member]
Oct. 04, 2012
Fursol [Member]
Computer Software [Member]
Jan. 31, 2013
Diberil Sociedad Anonima [Member]
Jul. 31, 2012
Diberil Sociedad Anonima [Member]
Jan. 31, 2013
Diberil Sociedad Anonima [Member]
Jan. 31, 2012
Diberil Sociedad Anonima [Member]
Oct. 31, 2012
Diberil Sociedad Anonima [Member]
May 30, 2012
Diberil Sociedad Anonima [Member]
Jul. 15, 2010
Diberil Sociedad Anonima [Member]
May 30, 2012
Diberil Sociedad Anonima [Member]
Geoconstruction [Member]
Mar. 31, 2012
Layne Do Brazil [Member]
Jan. 31, 2012
Wildcat [Member]
Feb. 28, 2011
Wildcat [Member]
Feb. 28, 2011
Wildcat [Member]
Water Infrastructure Group [Member]
Jan. 31, 2011
Bencor [Member]
Jan. 31, 2011
Bencor [Member]
Oct. 22, 2010
Bencor [Member]
Jan. 31, 2011
Bencor [Member]
Tradenames [Member]
Oct. 22, 2010
Bencor [Member]
Tradenames [Member]
Jan. 31, 2011
Bencor [Member]
Customer Backlog [Member]
Oct. 22, 2010
Bencor [Member]
Customer Backlog [Member]
Jan. 31, 2011
Bencor [Member]
Non-competition agreements [Member]
Oct. 22, 2010
Bencor [Member]
Non-competition agreements [Member]
Jan. 31, 2011
Intevras and Bencor [Member]
Jan. 31, 2011
Intevras and Bencor [Member]
Water Infrastructure Group [Member]
Jan. 31, 2011
Intevras Technologies [Member]
Jul. 27, 2010
Intevras Technologies [Member]
Jan. 31, 2011
Intevras Technologies [Member]
Minimum [Member]
Jan. 31, 2011
Intevras Technologies [Member]
Maximum [Member]
Jan. 31, 2011
Intevras Technologies [Member]
Patents [Member]
Jul. 27, 2010
Intevras Technologies [Member]
Patents [Member]
Jan. 31, 2011
Intevras Technologies [Member]
Tradenames [Member]
Jul. 27, 2010
Intevras Technologies [Member]
Tradenames [Member]
Jan. 31, 2011
SolmeteX [Member]
Jan. 31, 2011
SolmeteX [Member]
Nov. 30, 2007
SolmeteX [Member]
Business Acquisition [Line Items]                                                                                        
Percentage of stock acquired               100.00%                                 100.00%                                      
Aggregate purchase price of acquisition               $ 1,000,000               $ 34,267,000         $ 8,855,000       $ 32,073,000             $ 38,673,000     $ 6,600,000                  
Amount of cash paid in acquisition               850,000               16,150,000                 32,073,000             37,573,000     5,500,000                  
Remaining amount of cash to be paid in acquisition               150,000                                                                        
Payment date for remaining amount of cash to be paid in acquisition             Oct. 04, 2013                                                                          
Identifiable intangible asset associated with acquisition                   1,458,000                                 1,140,000   3,220,000   680,000               3,840,000   200,000      
Weighted average useful life                 3 years                                 10 years   18 months   6 years               9 years   10 years        
Purchase price allocation to noncurrent liability               458,000               16,981,000                 795,000             795,000                        
Remaining percentage of interest acquired                               50.00%                                                        
Aggregate purchase price to acquire remaining equity interest                               16,150,000                                                        
Amount of acquisition purchase price placed in escrow 2,861,000 443,000                           2,422,000         442,000       3,000,000             3,550,000     550,000                  
Initial percentage of interest acquired                                 50.00%                                                      
Loss on remeasurement of equity investment 7,705,000                     7,705,000                                                                
Estimated fair value of noncontrolling interest before acquisition                       15,794,000                                                                
Discounts for lack of control 5.00%                                                                                      
Discounts for lack of marketability 10.00%                                                                                      
Acquisition related costs                         228,000                     381,000                   65,000                    
Purchase price allocation, goodwill adjustment                     530,000                                                                  
Goodwill                               4,025,000   4,025,000     2,318,000 2,318,000     8,529,000             10,420,000 10,420,000   1,891,000                  
Additional purchase price of acquisition                             2,323,000                                                          
Income (loss) before income taxes of acquired entity included in the consolidated statements of operations                         8,052,000 3,345,000           925,000     8,214,000                                          
Cash payment for acquired shares previously held by noncontrolling interests 2,743,000                                   2,743,000                                                  
Decrease in noncontrolling interest                                     87,000                                                  
Adjustment to equity related to the acquisition of noncontrolling interest                                     2,656,000                                                  
Revenue of acquired entity included in the consolidated statements of operations                                       14,207,000     20,839,000                                          
Contingent consideration, maximum                                                                   10,000,000                   1,000,000
Contingent consideration, description                                                                   Contingent consideration up to a maximum of $10,000,000 (the "Intevras Earnout Amount"), which is based on a percentage of revenues earned on Intevras products and fixed amounts per barrel of water treated by Intevras products during the 60 months following the acquisition.               There was contingent consideration up to a maximum of $1,000,000 (the "SolmeteX Earnout Amount"), which was based on a percentage of the amount of SolmeteX's revenues during the 36 months following the acquisition.    
Contingent consideration, minimum                                                                   0                    
Contingent consideration, discount rate 41.20% 41.20%                                                               41.20%                    
Estimated annual revenues     1,500,000 1,500,000 6,100,000 6,100,000                                                           1,500,000 6,100,000              
Payment for contingent earnout consideration on prior year acquisitions                                                                                   $ 426,000 $ 689,000