Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended							12 Months Ended			12 Months Ended					0 Months Ended						12 Months Ended		3 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Carrying Amount	Dec. 31, 2012 Carrying Amount	Dec. 31, 2013 Fair Value	Dec. 31, 2012 Fair Value	Dec. 31, 2011 Stock Options	Dec. 31, 2013 GPRM Prestress, LLC	Dec. 31, 2013 GLP Alphalt, LLC	Dec. 31, 2013 Minimum	Dec. 31, 2013 Maximum	Dec. 31, 2013 Natural Materials and Construction	Oct. 02, 2013 Grace Pacific Corporation	Sep. 30, 2013 Kukui'ula Village LLC	Oct. 02, 2013 Permitted quarry rights Grace Pacific Corporation	Oct. 02, 2013 In-place leases Grace Pacific Corporation Minimum	Oct. 02, 2013 In-place leases Grace Pacific Corporation Maximum	Oct. 02, 2013 Above Market Leases Grace Pacific Corporation Minimum	Oct. 02, 2013 Above Market Leases Grace Pacific Corporation Maximum	Oct. 02, 2013 Order or Production Backlog Grace Pacific Corporation	Dec. 31, 2013 Performance Shares	Dec. 31, 2013 Time Based Restricted Stock Units	Jun. 30, 2012 Bakersfield (CA) joint venture	Dec. 31, 2012 Bakersfield (CA) joint venture	Sep. 30, 2013 Kukui'ula Village LLC	Dec. 31, 2011 Waiawa joint venture
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Noncontrolling controlling interest percentage in subsidiaries									51.00%	70.00%
Bank overdrafts		$ 2.2
Fair value of recorded loan				710.7	235.5	723.2	249.0
Terms of construction contracts (in years)											1 year	3 years
Accounts receivable and contracts retention													5.7
Accounts and contracts payable													0.6
Total interest cost incurred	20.8	16.8	17.6
Capitalized interest	1.8	2.0
Impairment of real estate assets	0	5.1	0
Impairment and equity losses	6.6	4.7	0																					4.7	4.7	6.3	6.4
Estimated useful lives of intangible assets (in years)																19 years	1 year	48 years	1 year	25 years	2 years 6 months
Aggregate intangible asset amortization	9.3	3.3	4.4
Goodwill	$ 99.6	$ 0	$ 0											$ 90.3	$ 9.3
Securities excluded from the computation of weighted average dilutive shares outstanding	0	0						0
Stock options granted (in shares)																						53,118	53,118
Vesting period																						2 years	3 years
Performance period																						2 years