CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets [Abstract]
Cash and cash equivalents	$ 10,526	$ 2,691
Restricted assets	567	3,821
Accounts receivable, net	125,413	90,297
Inventories, net	95,043	73,918
Costs in excess of billings on uncompleted contracts	9,059	5,176
Assets held for sale	2,795	6,198
Prepaid expenses and other current assets	8,902	8,682
Deferred income taxes	5,952	3,562
Total current assets	258,257	194,345
Property and equipment, net of accumulated depreciation	52,880	55,076
Intangible assets, net of accumulated amortization	25,353	25,865
Goodwill	7,186	6,511
Restricted assets	2,233	2,202
Other assets	2,160	2,013
Total assets	348,069	286,012
Current liabilities [Abstract]
Accounts payable	87,954	74,231
Accrued expenses and other liabilities	34,459	25,277
Revolving line of credit	0	72,218
Income taxes payable	6,100	2,939
Current portion of restructuring reserve	1,572	1,513
Current portion of capital lease obligation	1,343	1,329
Billings in excess of costs on uncompleted contracts	2,877	1,239
Total current liabilities	134,305	178,746
Revolving line of credit	60,073	0
Long-term portion of capital lease obligation	6,265	5,635
Deferred income taxes	15,650	16,983
Other long-term liabilities	7,528	9,007
Total liabilities	223,821	210,371
Commitments and contingencies (Note 12)
Stockholders' equity
Common stock	261	0
Additional paid-in capital	144,094	46,534
Retained deficit	(20,107)	(12,515)
Total stockholders' equity	124,248	34,164
Total liabilities and stockholders' equity	348,069	286,012
Redeemable Class A Junior Preferred Stock [Member]
Current liabilities [Abstract]
Preferred stock	0	0
Redeemable Class B Senior Preferred Stock [Member]
Current liabilities [Abstract]
Preferred stock	0	36,477
Convertible Class C Preferred Stock [Member]
Current liabilities [Abstract]
Preferred stock	0	5,000
Class A Common Stock [Member]
Stockholders' equity
Common stock	0	116
Class B Common Stock [Member]
Stockholders' equity
Common stock	$ 0	$ 29