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Condensed Consolidating Financial Statements (Condensed consolidating statements of cash flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from operating activities $ 2,407 $ (40,033) $ 64,742
Cash flows from investing activities      
Capital expenditures for property and equipment (24,043) (26,709) (16,828)
Acquisition of businesses, net of cash acquired (60,622) (162,189) (4,072)
Investment in unconsolidated subsidiary 0 (1,041) 0
Proceeds from sale of business, property and equipment 9,258 1,971 9,763
Long-term loans and advances to affiliates 0 0 0
Net cash used in investing activities (75,407) (187,968) (11,137)
Cash flows from financing activities      
Borrowings of debt 221,980 107,431  
Repayments of debt (211,783)    
Repurchases of stock (2,777) (4,742) (623)
Proceeds from stock issuance 249 1,491 87,676
Payment of capital lease obligations (1,147) (1,187) (92)
Deferred financing costs 0 (2,430) (766)
Long-term loans and advances to affiliates 0 0 0
Dividend paid to affiliates 0 0 0
Net cash provided by financing activities 6,522 100,563 86,195
Effect of exchange rate changes on cash (1,497) 8,232 (14,627)
Net increase (decrease) in cash, cash equivalents and restricted cash (67,975) (119,206) 125,173
Cash and cash equivalents and restricted cash      
Cash, cash equivalents and restricted cash at beginning of period 115,216 234,422 109,249
Cash, cash equivalents and restricted cash at end of period 47,241 115,216 234,422
Reportable Legal Entities | FET Inc. (Parent)      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from operating activities 10,461 (15,718) (16,882)
Cash flows from investing activities      
Capital expenditures for property and equipment 0 0 0
Acquisition of businesses, net of cash acquired 0 0 0
Investment in unconsolidated subsidiary 0 0  
Proceeds from sale of business, property and equipment 0 0 0
Long-term loans and advances to affiliates (18,130) (86,097) (69,340)
Net cash used in investing activities (18,130) (86,097) (69,340)
Cash flows from financing activities      
Borrowings of debt 221,980 107,431  
Repayments of debt (211,783)    
Repurchases of stock (2,777) (4,742) (623)
Proceeds from stock issuance 249 1,491 87,676
Payment of capital lease obligations 0 0 0
Deferred financing costs   (2,430) (766)
Long-term loans and advances to affiliates 0 0 0
Dividend paid to affiliates 0 0 0
Net cash provided by financing activities 7,669 101,750 86,287
Effect of exchange rate changes on cash 0 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash 0 (65) 65
Cash and cash equivalents and restricted cash      
Cash, cash equivalents and restricted cash at beginning of period 0 65 0
Cash, cash equivalents and restricted cash at end of period 0 0 65
Reportable Legal Entities | Guarantor Subsidiaries      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from operating activities (76) 483 31,055
Cash flows from investing activities      
Capital expenditures for property and equipment (20,288) (20,499) (12,033)
Acquisition of businesses, net of cash acquired (60,622) (157,297) (4,072)
Investment in unconsolidated subsidiary 0 (1,041)  
Proceeds from sale of business, property and equipment 5,192 2,038 9,442
Long-term loans and advances to affiliates 9,690 22,072 12,912
Net cash used in investing activities (66,028) (154,727) 6,249
Cash flows from financing activities      
Borrowings of debt 0 0  
Repayments of debt 0    
Repurchases of stock 0 0 0
Proceeds from stock issuance 0 0 0
Payment of capital lease obligations (1,030) (1,147) (253)
Deferred financing costs   0 0
Long-term loans and advances to affiliates 18,130 86,097 69,340
Dividend paid to affiliates 0 0 0
Net cash provided by financing activities 17,100 84,950 69,087
Effect of exchange rate changes on cash 0 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash (49,004) (69,294) 106,391
Cash and cash equivalents and restricted cash      
Cash, cash equivalents and restricted cash at beginning of period 73,981 143,275 36,884
Cash, cash equivalents and restricted cash at end of period 24,977 73,981 143,275
Reportable Legal Entities | Non-Guarantor Subsidiaries      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from operating activities 15,972 3,702 73,772
Cash flows from investing activities      
Capital expenditures for property and equipment (3,755) (6,210) (4,795)
Acquisition of businesses, net of cash acquired 0 (4,892) 0
Investment in unconsolidated subsidiary 0 0  
Proceeds from sale of business, property and equipment 4,066 (67) 321
Long-term loans and advances to affiliates 0 0 0
Net cash used in investing activities 311 (11,169) (4,474)
Cash flows from financing activities      
Borrowings of debt 0 0  
Repayments of debt 0    
Repurchases of stock 0 0 0
Proceeds from stock issuance 0 0 0
Payment of capital lease obligations (117) (40) 161
Deferred financing costs   0 0
Long-term loans and advances to affiliates (9,690) (22,072) (12,912)
Dividend paid to affiliates (23,950) (28,500) (23,203)
Net cash provided by financing activities (33,757) (50,612) (35,954)
Effect of exchange rate changes on cash (1,497) 8,232 (14,627)
Net increase (decrease) in cash, cash equivalents and restricted cash (18,971) (49,847) 18,717
Cash and cash equivalents and restricted cash      
Cash, cash equivalents and restricted cash at beginning of period 41,235 91,082 72,365
Cash, cash equivalents and restricted cash at end of period 22,264 41,235 91,082
Eliminations      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from operating activities (23,950) (28,500) (23,203)
Cash flows from investing activities      
Capital expenditures for property and equipment 0 0 0
Acquisition of businesses, net of cash acquired 0 0 0
Investment in unconsolidated subsidiary 0 0  
Proceeds from sale of business, property and equipment 0 0 0
Long-term loans and advances to affiliates 8,440 64,025 56,428
Net cash used in investing activities 8,440 64,025 56,428
Cash flows from financing activities      
Borrowings of debt 0 0  
Repayments of debt 0    
Repurchases of stock 0 0 0
Proceeds from stock issuance 0 0 0
Payment of capital lease obligations 0 0 0
Deferred financing costs   0 0
Long-term loans and advances to affiliates (8,440) (64,025) (56,428)
Dividend paid to affiliates 23,950 28,500 23,203
Net cash provided by financing activities 15,510 (35,525) (33,225)
Effect of exchange rate changes on cash 0 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash 0 0 0
Cash and cash equivalents and restricted cash      
Cash, cash equivalents and restricted cash at beginning of period 0 0 0
Cash, cash equivalents and restricted cash at end of period $ 0 $ 0 $ 0