Fair Value (Tables)

12 Months Ended

Dec. 31, 2012

West Construction, Inc.

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value measurement of fixed assets and goodwill on a non-recurring basis

	December 31, 2012			Level 1	Level II	Level III
Assets acquired in business combinations	$	5,936		—	—	$	5,936
Goodwill and other intangibles	$	3,352		—	—	$	3,352
Fair value of earnout liability	$	(271	)	—	—	$	(271	)

TWLD

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Fair value measurement of fixed assets and goodwill on a non-recurring basis

	December 31, 2010		Level 1	Level II	Level III
Assets acquired in business combinations	$	54,153	—	—	$	53,746
Goodwill and other intangibles	$	20,072	—	—	$	20,072