Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
Share data in Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 03, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Minimum
Dec. 31, 2013
Maximum
Dec. 31, 2013
Employee stock options
Dec. 31, 2013
Restricted Stock
Dec. 31, 2013
Restricted Stock
Minimum
Dec. 31, 2013
Restricted Stock
Maximum
Dec. 31, 2013
Restricted Stock Units
Dec. 31, 2013
Number of Customers
Customer
Dec. 31, 2012
Number of Customers
Customer
Dec. 31, 2011
Number of Customers
Customer
Dec. 31, 2013
Number of Customers
Customer Concentration Risk
Dec. 31, 2012
Number of Customers
Customer Concentration Risk
Dec. 31, 2011
Number of Customers
Customer Concentration Risk
Dec. 31, 2013
Number of Customers
Credit Concentration Risk
Dec. 31, 2012
Number of Customers
Credit Concentration Risk
Dec. 31, 2011
Number of Customers
Credit Concentration Risk
Sep. 30, 2013
Industrial Solutions
Dec. 31, 2013
Industrial Solutions
Dec. 31, 2013
Power Fuels Merger
Dec. 31, 2012
Power Fuels Merger
Nov. 30, 2012
Power Fuels Merger
Significant Accounting Policies [Line Items]                                                  
Amount collected from account receivable   $ (15,492,000) $ 2,101,000 $ 31,205,000                                     $ 100,000 $ 3,500,000  
Unbilled accounts receivable   21,200,000                                              
Estimated useful life         3 years 39 years                                      
Depreciation expense   78,800,000 40,100,000 21,400,000                                          
Goodwill   408,696,000 415,176,000 90,008,000                                         304,031,000
Impairment of goodwill                                         98,500,000 98,500,000      
Unamortized Deferred Financing Costs   20,806,000 24,400,000                                            
Impairment of Long-Lived Assets   111,900,000 6,030,000                                            
Concentration risk percentage                             40.00% 39.00% 25.00% 31.00% 34.00% 29.00%          
Number of customers                       3 3 1                      
Common stock reverse split ratio 0.1                                                
Common stock, shares authorized   50,000 50,000                                            
Common stock, shares issued   27,425 26,612                                            
Common stock, shares outstanding   25,994 25,181                                            
Share-based payment awards, service period from date of grant             3 years   2 years 3 years                              
Unrecognized compensation expense for employee stock options   2,500,000                                              
Unrecognized compensation expense, expected recognition period             9 months 18 days 1 year 3 months 18 days     1 year 3 months 18 days                            
Unrecognized compensation expense related to unvested shares of restricted stock   1,600,000           1,600,000     1,400,000                            
Reclassification of net loss from sales of available-for sale-securities included in earnings     $ 8,000