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Related PartyTransactions - Seabras Sapura Transactions - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Oct. 31, 2016 | Jun. 30, 2016 | Dec. 30, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Dec. 31, 2013 | Nov. 12, 2012 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | May 31, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vessel and rig operating expenses |  |  |  |  |  |  |  |  | $ 407.0 | $ 437.0 |  |
Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  | $ 3.0 |  |  |  |  | 3.0 |  | $ 3.0 |
Interest rate on related party debt |  |  |  | 4.40% |  |  |  |  |  |  |  |
Seabras Sapura [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest income, related party |  |  |  |  |  |  |  |  | 2.0 | 2.0 |  |
Interest receivable |  |  |  |  |  |  |  |  | 10.0 |  | 8.0 |
Seabras Sapura [Member] | Equity Method Investee [Member] | Brazil [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Vessel and rig operating expenses |  |  |  |  |  |  |  |  | 1.0 | $ 0.6 |  |
Seabras Sapura May 2014 Loan One [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  |  |  |  | 11.0 |  | 11.0 | $ 11.0
Loan receivable basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  | 3.40%
Seabras Sapura April 2015 Loan [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  | $ 14.0 |  |  |  | 14.0 |  | 14.0 |
Seabras Sapura June 2016 Loan [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  | $ 14.0 |  |  |  |  |  | 14.0 |  | 14.0 |
Seabras Sapura October 2016 Loan | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  | $ 12.0 |  |  |  |  |  |  | 12.0 |  | 12.0 |
Seabras Sapura December 2016 Loan One | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | $ 6.0 |  |  |  |  |  |  |  | 6.0 |  | 6.0 |
Seabras Sapura December 2016 Loan [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | $ 7.0 |  |  |  |  |  |  |  | 7.0 |  | 7.0 |
Interest rate on related party debt | 4.50% |  |  |  |  |  |  |  |  |  |  |
Seabras Sapura December 2016 Loan [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable | $ 7.0 |  |  |  |  |  |  |  | 7.0 |  | 7.0 |
Interest rate on related party debt | 4.50% |  |  |  |  |  |  |  |  |  |  |
Seabras Sapura January 2015 Loan [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notes receivable |  |  |  |  |  | $ 18.0 |  |  | 18.0 |  | 18.0 |
Interest rate on related party debt |  |  |  |  |  | 3.40% |  |  |  |  |  |
LIBOR [Member] | Seabras Sapura April 2015 Loan [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on related party debt |  |  |  |  | 3.99% |  |  |  |  |  |  |
LIBOR [Member] | Seabras Sapura June 2016 Loan [Member] | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on related party debt |  |  | 3.99% |  |  |  |  |  |  |  |  |
LIBOR [Member] | Seabras Sapura October 2016 Loan | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on related party debt |  | 3.99% |  |  |  |  |  |  |  |  |  |
LIBOR [Member] | Seabras Sapura December 2016 Loan One | Seabras Sapura Joint Venture [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on related party debt | 3.99% |  |  |  |  |  |  |  |  |  |  |
Other Trading [Member] | Seabras Sapura [Member] | Equity Method Investee [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest receivable |  |  |  |  |  |  |  |  | 4.0 |  | 6.0 |
Secured Debt [Member] | Seabras Sapura Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 543.0 |  |  |  |  |
Maximum exposure ratio |  |  |  |  | 5000.00% |  | 5000.00% |  |  |  |  |
Maximum guarantee |  |  |  |  |  |  |  |  | $ 312.0 |  | 328.0 |
Sapura Esmeralda [Member] | Seabras Sapura Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  | Jul. 29, 2019 |  |  |
Sapura Esmeralda [Member] | Secured Debt [Member] | Seabras Sapura Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | $ 36.0 | $ 179.0 |  |  |  |
Maximum guarantee |  |  |  |  |  |  |  |  | $ 174.0 |  | 184.0 |
Maturity date |  |  |  |  |  |  | Dec. 31, 2020 | Dec. 31, 2032 |  |  |  |
Sapura Diamante And Sapura Topazio [Member] | Secured Debt [Member] | Seabras Sapura Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum guarantee |  |  |  |  |  |  |  |  | $ 174.0 |  | $ 186.0 |
Sapura Onix Sapura Jade And Supra Rubi [Member] | Secured Debt [Member] | Seabras Sapura Joint Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | $ 780.0 |  |  |  |  |  |  |

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