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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 58,267,000 $ 58,559,000 $ 33,616,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation 29,080,000 24,104,000 17,904,000
Amortization of intangible assets 6,543,000 9,699,000 6,580,000
Goodwill and intangible impairment     1,732,000
Loss (gain) on sale of property and equipment (2,752,000) 335,000 (1,359,000)
Income from non-consolidated entities (186,000) (4,018,000) (4,630,000)
Distributions received from non-consolidated entities 1,358,000 10,136,000 9,491,000
Net deferred tax liabilities (assets) (879,000) 7,453,000 (1,091,000)
Changes in assets and liabilities:      
Customer retention deposits and restricted cash (3,887,000) (18,972,000) (5,673,000)
Accounts receivable (52,092,000) 20,767,000 (42,148,000)
Costs and estimated earnings in excess of billings 5,426,000 (24,591,000) (3,765,000)
Other current assets (1,341,000) (6,654,000) (6,837,000)
Other long term assets 0    
Accounts payable 34,338,000 17,241,000 12,391,000
Billings in excess of costs and estimated earnings 20,639,000 (67,539,000) 55,825,000
Contingent earnout liabilities (1,435,000) 2,927,000 290,000
Accrued expenses and other current liabilities 3,176,000 3,318,000 5,375,000
Other long-term liabilities 2,138,000 6,735,000 4,147,000
Net cash provided by operating activities 98,393,000 39,500,000 81,848,000
Cash flows from investing activities:      
Purchase of property and equipment (37,395,000) (29,052,000) (23,640,000)
Proceeds from sale of property and equipment 9,035,000 3,443,000 2,967,000
Purchase of short-term investments (6,869,000) (36,000,000) (44,000,000)
Sale of short-term investments 26,428,000 39,000,000 48,058,000
Investment in non-consolidated entities     (18,065,000)
Cash paid for acquisitions (86,207,000)   (39,120,000)
Cash acquired with acquisitions     19,623,000
Net cash used in by investing activities (95,008,000) (22,609,000) (54,177,000)
Cash flows from financing activities:      
Proceeds from issuance of long-term debt 94,471,000 44,000,000 27,500,000
Repayment of capital leases (9,021,000) (6,282,000) (4,600,000)
Repayment of long-term debt (26,633,000) (22,329,000) (12,696,000)
Repayment of subordinated debt (17,501,000) (20,710,000) (27,001,000)
Purchase of Unit Purchase Option   (2,030,000)  
Proceeds from issuance of common stock for warrants     21,690,000
Proceeds from issuance of common stock purchased by management under long-term incentive plan 1,240,000 647,000  
Stock issued to foreign managers     390,000
Repurchase of warrants     (277,000)
Repurchase of common stock (1,001,000)    
Dividends paid (7,695,000) (5,318,000) (4,404,000)
Cash distributions to former James shareholders     (1,966,000)
Net cash provided by (used in) financing activities 33,860,000 (12,022,000) (1,364,000)
Cash flows from discontinued operations      
Operating activities     (874,000)
Net change in cash and cash equivalents 37,245,000 4,869,000 25,433,000
Cash and cash equivalents at beginning of year 120,306,000 115,437,000 90,004,000
Cash and cash equivalents at end of the year 157,551,000 120,306,000 115,437,000
Cash paid during the year for:      
Interest 3,004,000 4,765,000 6,131,000
Income taxes, net of refunds received 31,404,000 33,600,000 26,794,000
Components of cash paid for acquisitions:      
Cash acquired     19,623,000
Fair value of assets acquired 136,146,000   141,570,000
Common stock issued (980,000)   (13,600,000)
Contingent liabilities (15,598,000)   (14,272,000)
Notes payable issued     (16,712,000)
Cash/stock payment due sellers after closing (605,000)    
Liabilities assumed (32,756,000)   (77,489,000)
Cash paid for acquisitions 86,207,000   39,120,000
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES      
Obligations incurred for the purchase of property and equipment 2,932,000 5,312,000  
Dividends declared and not yet paid   $ 1,532,000 $ 1,234,000