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Consolidated statements of comprehensive loss - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement [Abstract]                      
Revenues $ 272,948 $ 267,037 $ 274,003 $ 250,231 $ 247,700 $ 198,709 $ 201,115 $ 171,096 $ 1,064,219 $ 818,620 $ 587,635
Cost of sales 231,073 192,496 201,334 182,944 194,705 151,150 151,860 132,117 807,847 629,832 487,900
Gross profit 41,875 74,541 72,669 67,287 52,995 47,559 49,255 38,979 256,372 188,788 99,735
Operating expenses                      
Selling, general and administrative expenses                 286,980 253,713 227,008
Goodwill and intangible asset impairments                 363,522 69,062 0
Transaction expenses                 3,446 6,511 865
Loss (gain) on disposal of assets and other                 (438) 2,097 2,638
Total operating expenses 422,995 72,764 84,721 73,030 73,709 64,839 131,779 61,056 653,510 331,383 230,511
Earnings from equity investment 94 659 350 (963) (6,391) 3,361 2,568 1,462 140 1,000 1,824
Operating loss (381,026) 2,436 (11,702) (6,706) (27,105) (13,919) (79,956) (20,615) (396,998) (141,595) (128,952)
Other expense (income)                      
Interest expense                 32,532 26,808 27,410
Foreign exchange losses (gains) and other, net                 (6,270) 7,268 (21,341)
Gain on contribution of subsea rentals business       (33,500)         (33,506) 0 0
Gain realized on previously held equity investment         (120,400)       0 (120,392) 0
Deferred loan costs written off                 0 0 2,978
Total other expense (income), net 6,025 6,598 2,001 (21,868) (112,155) 8,726 8,987 8,126 (7,244) (86,316) 9,047
Loss before income taxes (387,051) (4,162) (13,703) 15,162 85,050 (22,645) (88,943) (28,741) (389,754) (55,279) (137,999)
Income tax expense (benefit) (3,308) (1,108) 1,646 (12,904) 35,981 (7,817) (11,070) (12,973) (15,674) 4,121 (56,051)
Net loss $ (383,743) $ (3,054) $ (15,349) $ 28,066 $ 49,069 $ (14,828) $ (77,873) $ (15,768) (374,080) (59,400) (81,948)
Less: Income attributable to noncontrolling interest                 0 0 30
Net loss attributable to common stockholders                 $ (374,080) $ (59,400) $ (81,978)
Weighted average shares outstanding                      
Basic (in shares) 109,082 108,856 108,714 108,423 105,947 96,275 96,170 95,860 108,771 98,689 91,226
Diluted (in shares) 109,082 108,856 108,714 110,857 108,581 96,275 96,170 95,860 108,771 98,689 91,226
Loss per share                      
Basic (in dollars per share) $ (3.52) $ (0.03) $ (0.14) $ 0.26 $ 0.46 $ (0.15) $ (0.81) $ (0.16) $ (3.44) $ (0.60) $ (0.90)
Diluted (in dollars per share) $ (3.52) $ (0.03) $ (0.14) $ 0.25 $ 0.45 $ (0.15) $ (0.81) $ (0.16) $ (3.44) $ (0.60) $ (0.90)
Other comprehensive income (loss), net of tax:                      
Net loss $ (383,743) $ (3,054) $ (15,349) $ 28,066 $ 49,069 $ (14,828) $ (77,873) $ (15,768) $ (374,080) $ (59,400) $ (81,948)
Change in foreign currency translation, net of tax of $0                 (24,752) 36,163 (45,722)
Gain (loss) on pension liability                 1,489 107 (335)
Comprehensive loss                 (397,343) (23,130) (128,005)
Less: comprehensive loss attributable to noncontrolling interests                 0 0 (162)
Comprehensive loss attributable to common stockholders                 $ (397,343) $ (23,130) $ (128,167)