Related Party Transactions (Detail) (USD $)	12 Months Ended														12 Months Ended				12 Months Ended					2 Months Ended
	Dec. 31, 2013 Management [Member] Related Customer [Member] Service Agreements [Member]	Dec. 31, 2012 Management [Member] Related Customer [Member] Service Agreements [Member]	Dec. 31, 2011 Management [Member] Related Customer [Member] Service Agreements [Member]	Dec. 31, 2013 Employment Contracts [Member] Management [Member] Related Customer [Member]	Dec. 31, 2012 Employment Contracts [Member] Management [Member] Related Customer [Member]	Dec. 31, 2011 Employment Contracts [Member] Management [Member] Related Customer [Member]	Dec. 31, 2013 Aircraft [Member] Management [Member]	Dec. 31, 2012 Aircraft [Member] Management [Member]	Dec. 31, 2011 Aircraft [Member] Management [Member]	Dec. 31, 2013 Property Subject to Operating Lease [Member] Immediate Family Member of Management or Principal Owner [Member]	Dec. 31, 2012 Property Subject to Operating Lease [Member] Immediate Family Member of Management or Principal Owner [Member]	Dec. 31, 2011 Property Subject to Operating Lease [Member] Immediate Family Member of Management or Principal Owner [Member]	Dec. 31, 2013 Life Insurance [Member] Management [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2012 Life Insurance [Member] Management [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2013 Life Insurance [Member] Board of Directors Chairman [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2012 Life Insurance [Member] Board of Directors Chairman [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2011 Life Insurance [Member] Board of Directors Chairman [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2013 Life Insurance [Member] Board of Directors Chairman [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] Maximum [Member]	Dec. 31, 2013 Life Insurance [Member] Chief Executive Officer [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2012 Life Insurance [Member] Chief Executive Officer [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2011 Life Insurance [Member] Chief Executive Officer [Member] Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member]	Dec. 31, 2013 Cross Country Pipeline [Member] Investments [Member] Management [Member]	Nov. 08, 2013 Cross Country Pipeline [Member] Investments [Member] Management [Member]	Dec. 31, 2013 Cross Country Pipeline [Member] Lease Agreements [Member] Machinery and Equipment [Member] Management [Member]
Related Party Transaction [Line Items]
Cost method investment, original cost																							$ 15,000,000
Cost method investment, additional information																						14.85% ownership interest
Expenses from transactions with related party							0	2,000	66,000	52,000	44,000	48,000												1,300,000
Charges to related party				600,000	500,000	500,000
Due from related party				100,000	900,000
Revenue, related party	1,300,000	1,200,000	1,100,000
Accounts receivable, related party	400,000	1,200,000
Life insurance, face amount																		200,000,000	11,000,000
Payments for life insurance policies															1,200,000	300,000	300,000		0	0	0
Carrying amount, life insurance policies													$ 10,200,000	$ 8,700,000