Fair Value Measurements (Schedule of Financial Statement Items Carried at Estimated Fair Value)(Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Jun. 05, 2014
Assets:
Restricted cash	$ 44,093,000	$ 44,370,000
Tutor Perini Corporation [Member]
Assets:
Restricted cash	3,369,000	3,369,000
Fair value measured on a recurring basis [Member] | Quoted prices in active markets (Level 1) [Member]
Assets:
Cash and cash equivalents	145,958,000	135,583,000
Restricted cash	44,093,000	44,370,000
Investments in lieu of retainage	22,670,000	25,761,000
Total assets	212,721,000	205,714,000
Fair value measured on a recurring basis [Member] | Significant other observable inputs (Level 2) [Member]
Assets:
Investments in lieu of retainage	8,755,000	7,463,000
Total assets	8,755,000	7,463,000
Liabilities:
Interest rate swap contract	305,000	381,000
Total liabilities	305,000	381,000
Fair value measured on a recurring basis [Member] | Significant unobservable inputs (Level 3) [Member]
Liabilities:
Contingent consideration	25,560,000	24,814,000
Total liabilities	25,560,000	24,814,000
Carrying value [Member] | Fair value measured on a recurring basis [Member]
Assets:
Cash and cash equivalents	145,958,000	135,583,000
Restricted cash	44,093,000	44,370,000
Investments in lieu of retainage	31,425,000	33,224,000
Total assets	221,476,000	213,177,000
Liabilities:
Interest rate swap contract	305,000	381,000
Contingent consideration	25,560,000	24,814,000
Total liabilities	25,865,000	25,195,000
Term Loan [Member]
Liabilities:
Face amount	$ 250,000,000		$ 200,000,000