Capital Stock (Details) (USD $)	12 Months Ended						12 Months Ended			36 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Common Stock [Member]	Sep. 08, 2008 Common Stock [Member]	Sep. 07, 2008 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member] Common Stock Repurchase Program [Member]	Mar. 31, 2011 Common Stock [Member] Common Stock Repurchase Program [Member]	Dec. 31, 2010 Common Stock [Member] Common Stock Repurchase Program [Member]	Dec. 31, 2010 Common Stock [Member] Common Stock Repurchase Program [Member]	Dec. 31, 2012 Preferred Stock [Member]	Dec. 31, 2011 Preferred Stock [Member]
Common Stock [Abstract]
Common stock, shares authorized (in shares)		75,000,000	75,000,000		75,000,000	40,000,000
Common stock, shares issued upon acquisition of shares of Tutor-Saliba (in shares)					22,987,293
Common stock, shares beneficially owned (in shares)				9,106,375
Common Stock Repurchase Program [Abstract]
Common stock, maximum authorized amount to be repurchased								$ 100,000,000
Common stock, shares repurchased and cancelled (in shares)							0		2,164,840	4,168,238
Common stock, value of shares repurchased and cancelled	$ 39,391,000								$ 39,400,000	$ 71,200,000
Common stock, average purchase price per share repurchased and cancelled (in dollars per share)										$ 17.08
Preferred Stock [Abstract]
Preferred stock, shares authorized (in shares)		1,000,000	1,000,000								1,000,000	1,000,000
Preferred stock, shares issued (in shares)		0	0								0	0
Preferred stock, shares outstanding (in shares)		0	0								0	0