Long-Term Debt and Notes Payable - Additional Information (Detail) (USD $)	6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended										1 Months Ended						6 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Mexico	Jun. 30, 2013 North Ocean Construction Financing North Ocean 102	Dec. 31, 2012 North Ocean Construction Financing North Ocean 102	Jun. 30, 2013 Maximum	Jun. 30, 2013 Maximum Amended Credit Agreement	Jun. 30, 2013 Minimum	Jun. 30, 2013 Base Rate	Jun. 30, 2013 Eurodollar rate	Jun. 30, 2013 Financial Letter of Credit	Jun. 30, 2013 Financial Letter of Credit Maximum	Jun. 30, 2013 Financial Letter of Credit Minimum	Jun. 30, 2013 Performance Letters of Credit	Jun. 30, 2013 Performance Letters of Credit Maximum	Jun. 30, 2013 Performance Letters of Credit Minimum	Jun. 30, 2013 Commitments	Sep. 30, 2010 Secured Debt North Ocean Construction Financing North Ocean 105 Installment	Jun. 30, 2013 Secured Debt North Ocean Construction Financing North Ocean 105	Dec. 31, 2012 Secured Debt North Ocean Construction Financing North Ocean 105	Jun. 30, 2013 Secured Debt Maximum Amended Credit Agreement	Sep. 30, 2010 Secured Debt Maximum North Ocean Construction Financing North Ocean 105	Apr. 20, 2012 Reimbursement Agreement	Jun. 30, 2013 Senior Unsecured Note Amended Credit Agreement	Jun. 30, 2013 Senior Unsecured Note Maximum Amended Credit Agreement	Jun. 30, 2013 Revolving Credit Facility	Jun. 30, 2013 Unsecured Debt
Debt Disclosure [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
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					2.50%		1.50%	1.00%
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										1.75%	2.50%	1.50%	0.875%	1.25%	0.75%	0.25%
Revolving credit, borrowings outstanding																									0
Letters of credit outstanding amount																						109,000,000			265,800,000	116,400,000
Credit facility, current borrowing capacity																									684,200,000
Credit facility, applicable interest rate																									4.00%
Applicable margin								1.75%	0.75%
Notes payable			34,400,000	37,300,000
Notes payable, current			34,400,000	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		$ 46,200,000