Long-Term Debt and Notes Payable - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended						12 Months Ended				12 Months Ended						12 Months Ended		12 Months Ended				12 Months Ended		12 Months Ended			9 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Eurodollar rate	Dec. 31, 2013 Base Rate	Dec. 31, 2013 Commitments	Dec. 31, 2013 Financial Letter of Credit	Dec. 31, 2013 Performance Letters of Credit	Dec. 31, 2013 Maximum	Sep. 30, 2014 Maximum Subsequent Event	Dec. 31, 2013 Maximum Financial Letter of Credit	Dec. 31, 2013 Maximum Performance Letters of Credit	Dec. 31, 2013 Minimum	Dec. 31, 2013 Minimum Financial Letter of Credit	Dec. 31, 2013 Minimum Performance Letters of Credit	Dec. 31, 2013 Amended Credit Agreement Maximum	Sep. 30, 2014 Amended Credit Agreement Maximum Subsequent Event	Jun. 30, 2014 Amended Credit Agreement Maximum Subsequent Event	Dec. 31, 2013 Revolving Credit Facility	Dec. 31, 2012 Revolving Credit Facility	Dec. 31, 2013 Revolving Credit Facility Maximum	Dec. 31, 2013 Mexico	Dec. 31, 2012 Mexico	Dec. 31, 2013 Brazil	Dec. 31, 2013 North Ocean Construction Financing North Ocean 102	Dec. 31, 2012 North Ocean Construction Financing North Ocean 102	Dec. 31, 2013 Senior Unsecured Note Amended Credit Agreement	Dec. 31, 2013 Senior Unsecured Note Amended Credit Agreement Maximum	Dec. 31, 2013 Secured Debt Amended Credit Agreement Maximum	Sep. 30, 2010 Secured Debt North Ocean Construction Financing North Ocean 105 Installment	Dec. 31, 2013 Secured Debt North Ocean Construction Financing North Ocean 105	Dec. 31, 2012 Secured Debt North Ocean Construction Financing North Ocean 105	Sep. 30, 2010 Secured Debt North Ocean Construction Financing North Ocean 105 Maximum	Apr. 20, 2012 ANZ Reimbursement Agreement	Dec. 31, 2013 Unsecured Debt	Dec. 31, 2012 Unsecured Debt	Mar. 02, 2014 Goldman Sachs Commitment Letter [Member] Subsequent Event
Debt Instrument [Line Items]
Letters of credit aggregate borrowing capacity							$ 950.0
Credit facility, maturity date	Aug. 19, 2016
Leverage ratio of indebtedness to EBITDA							3.00	3.00						3.75	3.75	3.75										5.00	2.00
Principal amount of notes																									300
Interest on outstanding loan balance	Loans outstanding under the Credit Agreement bear interest at the borrower's option at either the Eurodollar rate plus a margin ranging from 1.50% to 2.50% per year or the base rate (the highest of the Federal Funds rate plus 0.50%, the 30-day Eurodollar rate plus 1.0%, or the administrative agent's prime rate) plus a margin ranging from 0.50% to 1.50% per year. The applicable margin for revolving loans varies depending on the credit ratings of the Credit Agreement.
Interest on loan outstanding, margin over Eurodollar rate	1.00%						2.50%				1.50%
Interest on loan outstanding, margin over Federal Fund rate	0.50%
Interest on loan outstanding, margin over base rate							1.50%				0.50%
Commitment fee on the unused portion of credit agreement							0.45%				0.20%
Letter of credit fee				0.25%	2.00%	1.00%			2.50%	1.25%		1.50%	0.75%
Revolving credit, borrowings outstanding																	0	0
Letters of credit outstanding amount																	214.3	267.3														109.0	96.9	117.6
Credit facility, current borrowing capacity																	735.7
Credit facility, applicable interest rate																	2.28%
Borrowings under Credit Agreement																			80.0
Borrowings under Credit Agreement, Average outstanding																	23.5
Applicable margin		2.00%	1.00%
Aggregate principal amount under credit facility																																			950
Letter of credit facility, extended maturity date	Apr. 25, 2014
Notes payable																							31.4	37.3
Notes payable, current																							31.4	6.0					8.2	8.2
Debt description																							The debt bore interest at a rate equal to the three-month LIBOR (which resets every three months) plus a margin of 3.557% and matured in January 2014
Applicable margin for LIBOR borrowing																							3.557%
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%
Secured debt																															69.4
Business acquisition percentage, interests acquired																												75.00%
Secured debt, applicable interest rate																												2.76%
Principal repayment																													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																													57.2	65.4
Bonds issued related to JRMSA general agreement of indemnity																				$ 43.5	$ 50.1	$ 106.3