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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) attributable to Sterling common stockholders $ (35,900) $ 19,087 $ 23,704
Plus: Noncontrolling owners' interests in earnings of subsidiaries and joint ventures 1,196 7,137 1,824
Net income (loss) (34,704) 26,224 25,528
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Goodwill impairment 67,000 0 0
Depreciation and amortization 17,322 15,770 13,730
(Gain) loss on disposal of property and equipment (390) 1,900 249
Deferred tax expense (benefit) (18,651) 3,860 4,482
Interest expense accreted on noncontrolling interests 881 1,169 206
Stock-based compensation expense 503 595 586
Loss (gain) on sale of securities and other (3) 38 (519)
Tax benefits from exercise of stock options (58) 0 0
Other changes in operating assets and liabilities:      
(Increase) decrease in contracts receivable 1,933 9,982 15,138
(Increase) decrease in costs and estimated earnings in excess of billings on uncompleted contracts (5,921) (4,085) 3,778
(Increase) decrease in receivables from and equity in construction joint ventures 687 (4,403) (13)
(Increase) decrease in other current assets (538) 2,284 (1,582)
Increase (decrease) in accounts payables (7,942) 2,316 (11,185)
Increase (decrease) in billings in excess of costs and estimated earnings on uncompleted contracts (539) (13,325) (3,571)
Increase (decrease) in accrued compensation and other liabilities 1,408 4,748 519
Net cash provided by operating activities 20,988 47,073 47,346
Cash flows from investing activities:      
Net assets of acquired companies, net of cash acquired (3,911) 0 (60,490)
Acquisition of noncontrolling interest upon exercise of RHB Put (8,205) 0 0
Additions to property and equipment (23,989) (13,409) (5,277)
Purchases of short-term securities, available for sale (109,312) (137,547) (71,386)
Sales of short-term securities, available for sale 101,415 140,493 57,338
Proceeds from sale of property and equipment 1,296 1,607 435
Issuance of notes receivable 0 0 (350)
Net cash used in investing activities (42,706) (8,856) (79,730)
Cash flows from financing activities:      
Cumulative daily drawdowns - Credit Facility 18,500 57,700 188,000
Cumulative daily repayments - Credit Facility (18,500) (97,700) (203,000)
Distributions to noncontrolling interest owners (7,809) (4,160) (408)
Purchases of treasury stock (3,592) 0 0
Net proceeds from sale of common stock 0 0 46,810
Issuance of common stock pursuant to warrants and options exercised 156 1,051 308
Tax benefits from exercise of stock options 58 0 0
Other (165) (73) (225)
Net cash provided by (used in) financing activities (11,352) (43,182) 31,485
Net decrease in cash and cash equivalents (33,070) (4,965) (899)
Cash and cash equivalents at beginning of period 49,441 54,406 55,305
Cash and cash equivalents at end of period 16,371 49,441 54,406
Supplemental disclosures of cash flow information:      
Cash paid during the period for interest 299 44 31
Cash paid during the period for income taxes 1,444 3,740 7,000
Non-cash items:      
Reclassification of amounts payable to noncontrolling interest owner 1,054 0 0
Tax benefit related to the exercise of RHB's put/call liability 2,292 0 0
Net liabilities assumed in connection with acquisitions 1,961 0 0
Revaluation of noncontrolling interest - RLW put/call liability $ (1,268) $ 0 $ 0