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Condensed consolidating financial statements (Condensed consolidating statements of cash flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from (used in) operating activities $ 64,742 $ 155,913 $ 269,966
Cash flows from investing activities      
Acquisition of businesses, net of cash acquired (4,072) (60,836) (38,289)
Investment in unconsolidated subsidiary 0    
Capital expenditures for property and equipment (16,828) (32,291) (53,792)
Long-term loans and advances to affiliates 0 0 0
Other 9,763 1,821 21,390
Net cash used in investing activities (11,137) (91,306) (70,691)
Cash flows from financing activities      
Borrowings under credit facility due to acquisitions 0    
Borrowings under credit facility 0 94,984 15,423
Issuance of Senior Notes 0    
Repayment of long-term debt 0 (120,077) (98,415)
Long-term loans and advances to affiliates 0 0 0
Repurchases of stock (623) (6,438) (96,632)
Proceeds from stock issuance 87,676 5,275 11,101
Other (858) (681) 6,505
Net cash provided by (used in) financing activities 86,195 (26,937) (162,018)
Effect of exchange rate changes on cash (14,627) (5,000) (260)
Net increase in cash and cash equivalents 125,173 32,670 36,997
Cash and cash equivalents      
Beginning of period 109,249 76,579 39,582
End of period 234,422 109,249 76,579
Reportable Legal Entities | FET Inc. (Parent)      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from (used in) operating activities (16,882) (17,306) (16,796)
Cash flows from investing activities      
Acquisition of businesses, net of cash acquired 0 0 0
Investment in unconsolidated subsidiary 0    
Capital expenditures for property and equipment 0 0 0
Long-term loans and advances to affiliates (69,340) 38,019 191,290
Other 0 0 0
Net cash used in investing activities (69,340) 38,019 191,290
Cash flows from financing activities      
Borrowings under credit facility due to acquisitions 0    
Borrowings under credit facility 0 94,984 15,000
Issuance of Senior Notes 0    
Repayment of long-term debt 0 (120,077) (98,406)
Long-term loans and advances to affiliates 0 0 0
Repurchases of stock (623) (6,438) (96,632)
Proceeds from stock issuance 87,676 5,275 11,101
Other (766) (8) (6)
Net cash provided by (used in) financing activities 86,287 (26,264) (168,943)
Effect of exchange rate changes on cash 0 0 0
Net increase in cash and cash equivalents 65 (5,551) 5,551
Cash and cash equivalents      
Beginning of period 0 5,551 0
End of period 65 0 5,551
Reportable Legal Entities | Guarantor Subsidiaries      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from (used in) operating activities 31,055 112,629 175,700
Cash flows from investing activities      
Acquisition of businesses, net of cash acquired (4,072) (60,836) 0
Investment in unconsolidated subsidiary 0    
Capital expenditures for property and equipment (12,033) (23,035) (42,334)
Long-term loans and advances to affiliates 12,912 41,755 34,010
Other 9,442 1,057 20,862
Net cash used in investing activities 6,249 (41,059) 12,538
Cash flows from financing activities      
Borrowings under credit facility due to acquisitions 0    
Borrowings under credit facility 0 0 423
Issuance of Senior Notes 0    
Repayment of long-term debt 0 0 124
Long-term loans and advances to affiliates 69,340 (38,019) (191,290)
Repurchases of stock 0 0 0
Proceeds from stock issuance 0 0 0
Other (253) (673) 6,511
Net cash provided by (used in) financing activities 69,087 (38,692) (184,232)
Effect of exchange rate changes on cash 0 0 0
Net increase in cash and cash equivalents 106,391 32,878 4,006
Cash and cash equivalents      
Beginning of period 36,884 4,006 0
End of period 143,275 36,884 4,006
Reportable Legal Entities | Non-Guarantor Subsidiaries      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from (used in) operating activities 73,772 60,590 111,062
Cash flows from investing activities      
Acquisition of businesses, net of cash acquired 0 0 (38,289)
Investment in unconsolidated subsidiary 0    
Capital expenditures for property and equipment (4,795) (9,256) (11,458)
Long-term loans and advances to affiliates 0 0 0
Other 321 764 528
Net cash used in investing activities (4,474) (8,492) (49,219)
Cash flows from financing activities      
Borrowings under credit facility due to acquisitions 0    
Borrowings under credit facility 0 0 0
Issuance of Senior Notes 0    
Repayment of long-term debt 0 0 (133)
Long-term loans and advances to affiliates (12,912) (41,755) (34,010)
Dividend paid to affiliates (23,203)    
Repurchases of stock 0 0 0
Proceeds from stock issuance 0 0 0
Other 161 0 0
Net cash provided by (used in) financing activities (35,954) (41,755) (34,143)
Effect of exchange rate changes on cash (14,627) (5,000) (260)
Net increase in cash and cash equivalents 18,717 5,343 27,440
Cash and cash equivalents      
Beginning of period 72,365 67,022 39,582
End of period 91,082 72,365 67,022
Eliminations      
Condensed Cash Flow Statements, Captions [Line Items]      
Cash flows from (used in) operating activities (23,203) 0 0
Cash flows from investing activities      
Acquisition of businesses, net of cash acquired 0 0 0
Investment in unconsolidated subsidiary 0    
Capital expenditures for property and equipment 0 0 0
Long-term loans and advances to affiliates 56,428 (79,774) (225,300)
Other 0 0 0
Net cash used in investing activities 56,428 (79,774) (225,300)
Cash flows from financing activities      
Borrowings under credit facility due to acquisitions 0    
Borrowings under credit facility 0 0 0
Issuance of Senior Notes 0    
Repayment of long-term debt 0 0 0
Long-term loans and advances to affiliates (56,428) 79,774 225,300
Dividend paid to affiliates 23,203    
Repurchases of stock 0 0 0
Proceeds from stock issuance 0 0 0
Other 0 0 0
Net cash provided by (used in) financing activities (33,225) 79,774 225,300
Effect of exchange rate changes on cash 0 0 0
Net increase in cash and cash equivalents 0 0 0
Cash and cash equivalents      
Beginning of period 0 0 0
End of period $ 0 $ 0 $ 0