Long-Term Debt and Notes Payable - Additional Information 2 (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended								6 Months Ended		6 Months Ended	1 Months Ended	6 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2014 Reimbursement Agreement [Member]	Dec. 31, 2013 Reimbursement Agreement [Member]	Apr. 20, 2012 ANZ Reimbursement Agreement [Member]	Jun. 30, 2014 Mexico [Member]	Dec. 31, 2013 Mexico [Member]	Jun. 30, 2014 Brazil [Member]	Dec. 31, 2013 Brazil [Member]	Jun. 30, 2014 North Ocean Construction Financing [Member] North Ocean 102 [Member]	Dec. 31, 2013 North Ocean Construction Financing [Member] North Ocean 102 [Member]	Jun. 30, 2014 Minimum [Member]	Apr. 30, 2014 Senior Notes [Member]	Jun. 30, 2014 Senior Notes [Member]	Jun. 30, 2014 Secured Debt [Member] North Ocean Construction Financing [Member] North Ocean 105 [Member] Installment	Sep. 30, 2010 Secured Debt [Member] North Ocean Construction Financing [Member] North Ocean 105 [Member]	Dec. 31, 2013 Secured Debt [Member] North Ocean Construction Financing [Member] North Ocean 105 [Member]	Jun. 30, 2014 Secured Debt [Member] Maximum [Member] North Ocean Construction Financing [Member] North Ocean 105 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debt issued												$ 500.0	$ 500.0
Debt instrument interest rate													8.00%		2.76%
Debt instrument maturity date	Apr. 17, 2017												May 01, 2021
Units issued	11,500,000
Tangible units interest rate percentage	6.25%
Unit price per share	25.00
Initial principal amount per amortizing note	4.1266
Amortizing note interest rate percentage	7.75%
Additional Paid in capital	240.0
Tangible equity units, aggregate principal amount												47.5	47.5
Current notes payable	14.5									31.4				8.2		8.2
Maximum settlement rate per tangible equity unit	$ 3.5562
Dilutive common shares issuable under common stock purchase contracts	40,900,000										33,400,000
Dilutive common shares issuable under common stock purchase contracts, per unit											$ 2.9030
Secured debt																	69.4
Business acquisition percentage, interests acquired														75.00%
Principal repayment	April 16, 2015													The agreement provides for borrowings of up to $69.4 million, bearing interest at 2.76% per year, and requires principal repayment in 17 consecutive semi-annual installments, which commenced on October 1, 2012.
Number of consecutive semi-annual installments														17
Borrowing outstanding														53.1		57.2
Notes payable										31.4
Debt description									The outstanding debt bore interest at a rate equal to the three-month LIBOR (which was subject to reset every three months) plus a margin of 3.315%. JRMSA paid in full the approximately $31.4 million notes payable balance upon maturity during January 2014.
Applicable margin for LIBOR borrowing									3.315%
Debt maturity date									2014-01
Percentage of debt guaranteed by JRMSA									50.00%
Repayments of notes payable by JRMSA									31.4
Ownership percentage in Oceanteam ASA's									50.00%
Bank guarantees issued		50.4	55.8
Letters of credit outstanding		12.0	39.8	109.0
Bonds issued related to JRMSA general agreement of indemnity					$ 42.1	$ 43.5	$ 0	$ 106.3