Long-Term Debt and Notes Payable - Additional Information (Detail) (USD $)	9 Months Ended		3 Months Ended	9 Months Ended					9 Months Ended			3 Months Ended								1 Months Ended						9 Months Ended
	Sep. 30, 2013	Sep. 30, 2013 Mexico	Sep. 30, 2013 Revolving Credit Facility	Sep. 30, 2013 Revolving Credit Facility	Sep. 30, 2013 North Ocean Construction Financing North Ocean 102	Dec. 31, 2012 North Ocean Construction Financing North Ocean 102	Sep. 30, 2013 Eurodollar rate	Sep. 30, 2013 Base Rate	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum	Sep. 30, 2013 Maximum Amended Credit Agreement	Sep. 30, 2013 Maximum Revolving Credit Facility	Sep. 30, 2013 Commitments	Sep. 30, 2013 Financial Letter of Credit	Sep. 30, 2013 Financial Letter of Credit Minimum	Sep. 30, 2013 Financial Letter of Credit Maximum	Sep. 30, 2013 Performance Letters of Credit	Sep. 30, 2013 Performance Letters of Credit Minimum	Sep. 30, 2013 Performance Letters of Credit Maximum	Sep. 30, 2010 Secured Debt North Ocean Construction Financing North Ocean 105 Installment	Sep. 30, 2013 Secured Debt North Ocean Construction Financing North Ocean 105	Dec. 31, 2012 Secured Debt North Ocean Construction Financing North Ocean 105	Sep. 30, 2013 Secured Debt Maximum Amended Credit Agreement	Sep. 30, 2010 Secured Debt Maximum North Ocean Construction Financing North Ocean 105	Apr. 20, 2012 ANZ Reimbursement Agreement	Sep. 30, 2013 Senior Unsecured Note Amended Credit Agreement	Sep. 30, 2013 Senior Unsecured Note Maximum Amended Credit Agreement	Sep. 30, 2013 Unsecured Debt
Debt Instrument [Line Items]
Letters of credit aggregate borrowing capacity										$ 950,000,000
Credit facility, maturity date	Aug. 19, 2016
Leverage ratio of indebtedness to EBITDA										3.00	3.75												2.00				5.00
Principal amount of notes																										300,000,000
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%								1.50%	2.50%
Interest on loan outstanding, margin over Federal Fund rate	0.50%
Interest on loan outstanding, margin over base rate									0.50%	1.50%
Commitment fee on the unused portion of credit agreement									0.20%	0.45%
Letter of credit fee													0.25%	1.75%	1.50%	2.50%	0.875%	0.75%	1.25%
Revolving credit, borrowings outstanding			0	0
Letters of credit outstanding amount			237,000,000	237,000,000																					109,000,000			82,600,000
Credit facility, current borrowing capacity			713,000,000	713,000,000
Credit facility, applicable interest rate				2.16%
Borrowings under Credit Agreement												80,000,000
Borrowings under Credit Agreement, Average outstanding			40,000,000
Applicable margin							1.75%	0.75%
Notes payable					32,900,000	37,300,000
Notes payable, current					32,900,000	6,000,000															8,200,000	8,200,000
Debt description					The outstanding debt bears interest at a rate equal to the three-month LIBOR (which resets every three months) plus a margin of 3.315% and matures in January 2014.
Applicable margin for LIBOR borrowing					3.315%
Debt maturity date					2014-01
Percentage of debt guaranteed by JRMSA					50.00%
Secured debt																								69,400,000
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																					61,300,000	65,400,000
Bonds issued related to JRMSA general agreement of indemnity		$ 46,500,000