Power Solutions International (PSIX) 10-Q 8 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Aug. 05, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'PSIX	'
Entity Registrant Name	'Power Solutions International, Inc.	'
Entity Central Index Key	'0001137091	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	10,728,222

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash	$5,706	$6,306
Accounts receivable, net	56,299	42,730
Inventories, net	78,598	55,986
Prepaid expenses and other current assets	5,682	2,173
Deferred income taxes	2,811	2,811
Total current assets	149,096	110,006
Property, plant & equipment, net	18,539	13,104
Intangible assets, net	22,271	'
Goodwill	22,372	'
Other noncurrent assets	4,921	3,509
TOTAL ASSETS	217,199	126,619
Current liabilities	'	'
Accounts payable	38,636	24,444
Income taxes payable	'	167
Accrued compensation and benefits	3,487	3,758
Current maturities of long-term debt	1,667	'
Contingent consideration	8,000	'
Other accrued liabilities	5,325	4,016
Total current liabilities	57,115	32,385
Long-term obligations	'	'
Revolving line of credit	70,082	17,933
Deferred income taxes	304	304
Private placement warrants	16,873	24,525
Long-term debt, less current maturities	3,194	'
Other noncurrent liabilities	868	1,051
TOTAL LIABILITIES	148,436	76,198
COMMITMENTS AND CONTINGENCIES	'	'
STOCKHOLDERS' EQUITY	'	'
Series A convertible preferred stock - $0.001 par value. Authorized: 114,000 shares. Issued and outstanding: -0- shares at June 30, 2014 and December 31, 2013.	0	0
Common stock - $0.001 par value. Authorized: 50,000,000 shares. Issued: 11,559,147 and 11,352,812 shares at June 30, 2014 and December 31, 2013, respectively. Outstanding: 10,728,222 and 10,521,887 at June 30, 2014 and December 31, 2013, respectively.	12	11
Additional paid-in-capital	68,837	57,308
Retained earnings (accumulated deficit)	4,164	-2,648
Treasury stock, at cost, 830,925 shares at June 30, 2014 and December 31, 2013.	-4,250	-4,250
TOTAL STOCKHOLDERS' EQUITY	68,763	50,421
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$217,199	$126,619

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]	'	'
Series A convertible preferred stock, par value	$0.00	$0.00
Series A convertible preferred stock, shares authorized	114,000	114,000
Series A convertible preferred stock, shares issued	0	0
Series A convertible preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	11,559,147	11,352,812
Common stock, shares outstanding	10,728,222	10,521,887
Treasury stock, at cost	830,925	830,925

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net sales	$83,378,000	$59,138,000	$150,113,000	$111,714,000
Cost of sales	67,982,000	47,954,000	122,787,000	91,361,000
Gross profit	15,396,000	11,184,000	27,326,000	20,353,000
Operating expenses:	'	'	'	'
Research & development and engineering	3,745,000	2,289,000	7,343,000	4,060,000
Selling and service	2,338,000	2,089,000	4,165,000	3,969,000
General and administrative	3,420,000	2,966,000	6,404,000	5,404,000
Total operating expenses	9,503,000	7,344,000	17,912,000	13,433,000
Operating income	5,893,000	3,840,000	9,414,000	6,920,000
Other (income) expense:	'	'	'	'
Interest expense	381,000	241,000	480,000	435,000
Loss on debt extinguishment	'	270,000	'	270,000
Contingent consideration	-900,000	'	-900,000	'
Private placement warrant (income) expense	-99,000	4,207,000	-332,000	9,053,000
Other expense (income), net	52,000	-17,000	75,000	-17,000
Total other (income) expense	-566,000	4,701,000	-677,000	9,741,000
Income (loss) before income taxes	6,459,000	-861,000	10,091,000	-2,821,000
Income tax provision	2,021,000	1,239,000	3,279,000	2,206,000
Net income (loss)	$4,438,000	($2,100,000)	$6,812,000	($5,027,000)
Common Shares [Member]	'	'	'	'
Weighted-average common shares outstanding:	'	'	'	'
Basic	10,627,913	9,243,773	10,585,187	9,171,942
Diluted	11,153,155	9,243,773	11,103,875	9,171,942
Earnings (loss) per share - basic Common shares	$0.42	($0.23)	$0.64	($0.55)
Earnings (loss) per share - diluted Common shares	$0.39	($0.23)	$0.58	($0.55)

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities	'	'
Net income (loss)	$6,812	($5,027)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:	'	'
Depreciation and amortization	1,685	749
Non-cash interest expense	38	36
Share-based compensation expense	663	675
Decrease in accounts receivable allowances	-270	-10
Increase in inventory reserves	434	616
Inventory step up to fair value	482	'
(Decrease) increase in valuation of private placement warrants liability	-332	9,053
Decrease in valuation of contingent consideration liability	-900	'
Loss on investment in joint venture	100	'
Loss on disposal of assets	60	2
Loss on debt extinguishment	'	270
(Increase) decrease in operating assets:	'	'
Accounts receivable	-9,310	2,428
Inventories	-18,455	-8,580
Prepaid expenses and other assets	-3,686	-221
Increase (decrease) in operating liabilities:	'	'
Accounts payable	11,104	-4,251
Accrued compensation and benefits and other accrued liabilities	-2,191	-92
Income taxes payable	-27	-847
Other noncurrent liabilities	-351	-7
Net cash used in operating activities	-14,144	-5,206
Cash flows from investing activities	'	'
Purchases of property, plant, equipment and other assets	-2,415	-2,617
Acquisition of Professional Power Products, Inc., net of cash acquired	-44,122	'
Investment in joint venture	-350	'
Net cash used in investing activities	-46,887	-2,617
Cash flows from financing activities	'	'
Initial proceeds from borrowings under revolving line of credit	'	38,995
Repayment of prior revolving line of credit	'	-38,945
Proceeds from long-term debt	5,000	'
Proceeds from exercise of private placement warrants	1,425	2,719
Excess tax benefit from exercise of share-based awards	2,462	'
Payment of withholding taxes from net settlement of share-based awards	-340	'
Payments on long-term debt	-139	'
Cash paid for financing and transaction fees	-126	-261
Net cash provided by financing activities	60,431	8,715
(Decrease) increase in cash	-600	892
Cash at beginning of period	6,306	543
Cash at end of period	5,706	1,435
Supplemental disclosures of cash flow information	'	'
Cash paid for interest	290	468
Cash paid for income taxes	2,525	3,054
Supplemental disclosure of non-cash transactions	'	'
Unpaid property, plant, equipment and other assets	1,594	923
Fair value of private placement warrants exercised	7,320	2,799
Unpaid financing and transaction fees	'	208
Noncurrent obligation [Member]	'	'
Cash flows from financing activities	'	'
Advances from revolving line of credit	58,049	59,807
Repayment of prior revolving line of credit	($5,900)	($53,600)

Description_of_the_company_and

Description of the company and business operations	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Description of the company and business operations	'
	1. Description of the company and business operations
	Description of the company
	Power Solutions International, Inc., a Delaware corporation, (“Company”), is the successor in a migratory merger (“Migratory Merger”) effective August 26, 2011, to Power Solutions International, Inc., a Nevada corporation. “Power Solutions International” and “PSI” refer to Power Solutions International, Inc., a Nevada corporation, prior to the consummation of the Migratory Merger, and Power Solutions International, Inc., a Delaware corporation, following the consummation of the Migratory Merger.
	Power Solutions International, Inc., a Nevada corporation, was formerly known as Format, Inc. (“Format”), and prior to the consummation of a reverse recapitalization, was engaged, to a limited extent, in EDGARizing corporate documents for filing with the Securities and Exchange Commission (“SEC”) and in providing limited commercial printing services. On April 29, 2011, Format consummated a reverse acquisition transaction with The W Group, Inc. and its subsidiaries (“The W Group”) (“Reverse Recapitalization”), and in connection with this transaction, Format changed its corporate name to Power Solutions International, Inc. The W Group was considered the accounting acquirer and remained as the surviving corporation of the reverse acquisition, becoming a wholly-owned subsidiary of Power Solutions International, Inc.
	Nature of business operations
	The Company is a global producer and distributor of a broad range of high performance, certified low emission, power systems, including alternative fuel power systems, for original equipment manufacturers of off-highway industrial equipment (“industrial OEMs”) and large custom-engineered integrated electrical power generation systems. The Company’s customers include large, industry-leading and/or multinational organizations. The Company’s products and services are sold predominantly to customers throughout North America, as well as, to customers located throughout Asia and Europe. The Company operates as one business and geographic segment.
	The Company’s power systems are highly engineered, comprehensive systems which, through its technologically sophisticated development and manufacturing processes, including its in-house design, prototyping, testing and engineering capabilities and its analysis and determination of the specific components to be integrated into a given power system (driven in large part by emission standards and cost restrictions required, or desired, to be met), allow the Company to provide to its customers power systems customized to meet specific industrial OEM application requirements, other technical specifications of customers, and requirements imposed by environmental regulatory bodies. The Company’s power system configurations range from a basic engine integrated with appropriate fuel system components to completely packaged power systems that include any combination of cooling systems, electronic systems, air intake systems, fuel systems, housings, power takeoff systems, exhaust systems, hydraulic systems, enclosures, brackets, hoses, tubes and other assembled componentry. The Company purchases engines from third party suppliers and produces an internally-designed engine, all of which engines are then integrated into the Company’s power systems. Additionally, the Company is designing and developing other engines in-house. Of the other components that the Company integrates into its power systems, a substantial portion consist of internally designed components and components for which the Company coordinates significant design efforts with third party suppliers, with the remainder consisting largely of parts that are sourced off-the-shelf from third party suppliers. Some of the key components (including purchased engines) embody proprietary intellectual property of the Company’s suppliers. As a result of its design and manufacturing capabilities, the Company is able to provide its customers with a comprehensive power system which can be incorporated, using a single part number, directly into a customer’s specified application. Capitalizing on its expertise in developing and manufacturing emission-certified power systems and its access to the latest power system technologies, the Company believes that it is able to provide complete “green” power systems to industrial OEMs at a low cost and with fast design turnaround. In addition to the certified products described above, the Company sells diesel and non-certified power systems and aftermarket components.

Acquisition_of_Professional_Po

Acquisition of Professional Power Products, Inc.	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Acquisition of Professional Power Products, Inc.	'
	2. Acquisition of Professional Power Products, Inc.
	On April 1, 2014 (the “Date of Acquisition”), the Company acquired Professional Power Products, Inc. (“PPPI”), pursuant to a Stock Purchase Agreement, with Carl L. Trent and Kenneth C. Trent (each individually as “Shareholder” and collectively as “Shareholders”) and CKT Holdings Inc., a Wisconsin corporation (the “Seller”) owned by the Shareholders. PPPI is a leading designer and manufacturer of large, custom engineered integrated electrical power generation systems serving the global diesel and natural gas power generation market. On the Date of Acquisition, the Company purchased from the Seller all of the issued and outstanding stock of PPPI, an Illinois corporation and wholly-owned subsidiary of the Seller, for cash of $45.4 million, including cash acquired of $1.3 million, plus contingent consideration initially valued at $8.9 million, for an initial purchase price of $54.3 million, as of the Date of Acquisition. The value of the contingent consideration to be paid ranges from $5.0 million to $15.0 million, with a final determination based upon PPPI’s 2014 full year operating results. The contingent consideration will be payable in shares of the Company’s common stock, based upon a common share value of $76.02 as determined by the terms of the Stock Purchase Agreement. The Stock Purchase Agreement includes a provision by and among the Company, Shareholders and Seller to treat the purchase of the PPPI stock as an acquisition of assets for income tax purposes. The Acquisition was approved by the Company’s Board of Directors.
	The Company incurred total transaction costs related to the acquisition of approximately $811,000, all of which was recognized in the six months ended June 30, 2014 in accordance with U.S. GAAP. To facilitate the transaction, the Company entered into an amended and restated credit agreement with Wells Fargo Bank, N.A. increasing its revolving line of credit from $75.0 million to $90.0 million and securing a $5.0 million term loan, among other things. Refer to Note 9, “Revolving line of credit and term loan” for a further description of these obligations.
	The acquisition of PPPI has been accounted for as a business combination in accordance with ASC 805, Business Combinations, and, as such, assets acquired and liabilities assumed have been recorded at their respective fair values. The excess of the acquisition consideration over the fair value of assets acquired and liabilities assumed was allocated to goodwill. The determination of the estimated fair values required management to make significant estimates and assumptions. The more significant assumptions included estimating future cash flows and developing appropriate discount rates. These estimates and assumptions of the fair value allocation are preliminary and subject to change upon the finalization of all valuation analyses, which are in the process of being completed. Independent valuation specialists conducted a valuation to assist management of the Company in determining the estimated fair values of inventory, machinery and equipment, intangible assets and contingent consideration. The Company’s management is responsible for the internal and third party valuations and appraisals. The work performed by the independent valuation specialists, while not yet completed and finalized, has been considered in management’s estimates of fair values reflected. The determinations of these estimated fair values, the assets’ useful lives and the amortization methods are subject to finalization of the work performed by the independent valuation specialists. Fair value measurements can be highly subjective, and the reasonable application of measurement principles may result in a range of alternative estimates using the same facts and circumstances. The final allocation could be materially different from the preliminary allocation set forth below. Although the final determinations may result in asset and liability fair values that are materially different than the preliminary estimates of the amounts included herein, it is not expected that those differences will be material to an understanding of the impact of this transaction on the financial results of the Company.
	The purchase price for this acquisition has been provisionally allocated to the assets acquired and liabilities assumed based on their estimated fair values as follows:
		April 1, 2014 (Date
		of Acquisition)
	Assets acquired:
	Cash	$	1,277
	Accounts receivable		3,989
	Inventories		5,073
	Prepaid expenses and other current assets		243
	Property, plant & equipment		2,596
	Total tangible assets	$	13,178
	Intangible assets:
	Intangible assets	$	23,500
	Goodwill		22,372
	Total assets acquired	$	59,050
	Liabilities assumed:
	Accounts payable	$	1,494
	Accrued liabilities		3,257
	Total liabilities assumed	$	4,751
	Net assets acquired	$	54,299
	The above estimated fair values of assets acquired and liabilities assumed are based on the information that was available through June 30, 2014 and are provisional. There are inherent uncertainties and management judgment required in these determinations. The fair value measurements of the assets acquired and liabilities assumed were based on valuations involving significant unobservable inputs, or Level 3 in the fair value hierarchy. The Company believes that this information provides a reasonable basis for estimating the fair values but is waiting for certain additional information necessary to finalize those amounts. Thus, the provisional measurements of fair value reflected are subject to change. Except as discussed below, the assets acquired and the liabilities assumed were stated at their estimated fair values at the Date of Acquisition.
	The fair value of accounts receivable acquired was adjusted for amounts known or highly likely to be uncollectible based upon an assessment of known facts and circumstances as of the Date of Acquisition and additional information arising subsequent to the Date of Acquisition with respect to these known facts and circumstances.
	The inventory acquired was revalued to its fair value. While the cost of raw materials generally approximates fair value, the value of work in process and finished goods inventory was “stepped up” by $482,000, representing the estimated selling price of that inventory less the sum of costs to complete and a reasonable allowance for the Company’s selling efforts. This “stepped up” inventory value was recognized within the Company’s cost of sales in the three months ended June 30, 2014.
	The identifiable intangible assets as a result of the acquisition will be amortized over their respective estimated useful lives as follows:
		Asset			Estimated
		amount			life
	Backlog	$	1,200		18 months
	Customer relationships		20,600		13 years
	Trade names and trademarks		1,700		13 years
	Total identifiable intangible assets	$	23,500
	The amortization period based on the estimated useful lives of the intangible assets has been presented above. The fair value of backlog and customer relationships was derived using the multi-period excess earnings method. The fair value of the trade names and trademarks was derived using the relief from royalty method.
	The fair value of property, plant and equipment was based upon an appraisal of these assets or the acquisition costs of assets acquired immediately prior to the acquisition date.
	The Company’s liability for the contingent consideration was measured at fair value based on unobservable inputs, and thus was considered a Level 3 financial instrument. The fair value of the liability was primarily driven by the Company’s expectations of achieving the performance measures required by the Stock Purchase Agreement, the resulting shares expected to be issued, and the share price of the Company’s common stock. The expected performance metrics and resulting shares expected to be issued were estimated based on a Monte Carlo simulation model considering actual and forecasted results over the measurement period.
	Goodwill largely consists of geographic expansion of product sales, manufacturing and other synergies of the combined companies, and the value of the assembled workforce.
	As a result of the provisions within the Stock Purchase Agreement, the Company treated the acquisition of PPPI as a purchase of assets for income tax purposes. Accordingly, the financial and income tax bases of the assets and liabilities were the same at the Date of Acquisition, and a provision for deferred income tax was not required to be recorded in connection with the purchase price allocation. Goodwill is expected to be deductible for tax purposes.
	The assets, liabilities, and operating results of PPPI have been included in the Company’s unaudited condensed consolidated financial statements from the Date of Acquisition to June 30, 2014, which is all of the three month period ended June 30, 2014. For such period, PPPI contributed sales, net of intercompany transactions, of $7,272,000 and operating loss of $31,000 to the Company’s consolidated results. The impact of PPPI’s net loss and basic and diluted earnings per share loss amounts are not material to the Company’s unaudited condensed consolidated financial statements for the three months ended June 30, 2014. Amortization expense related to identifiable intangible assets associated with the acquisition, included in the table above and the unaudited condensed consolidated financial statements, approximated $555,000 for the three months ended June 30, 2014.
	The following supplemental pro forma information presents the financial results as if the transaction had occurred on January 1, 2013 as follows:
		Three months			Six months ended
		ended
		June 30,			June 30,		June 30,
		2013			2014		2013
	Net sales	$	67,567		$	155,293	$	128,699
	Net (loss) income	$	(2,343	)	$	6,199	$	(4,684	)
	(Loss) earnings per share, basic	$	(0.25	)	$	0.59	$	(0.51	)
	(Loss) earnings per share, diluted	$	(0.25	)	$	0.56	$	(0.51	)
	The pro forma information presented above is for information purposes only and is not indicative of the results of operations that would have been achieved if the acquisition had taken place at an earlier date, nor are these results necessarily indicative of future consolidated results of operations of the Company.

Basis_of_presentation

Basis of presentation	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Basis of presentation	'
	3. Basis of presentation
	Unaudited condensed consolidated financial statements
	The unaudited condensed consolidated financial statements of Power Solutions International, Inc. present information in accordance with generally accepted accounting principles in the U.S. (“GAAP”), have been prepared pursuant to the rules and regulations of the SEC and, in the opinion of management, reflect all normal and recurring adjustments necessary to present fairly the interim periods of the unaudited condensed consolidated financial position, results of operations and cash flows of the Company and its wholly-owned subsidiaries for the periods presented.
	These unaudited condensed consolidated financial statements should be read in conjunction with, and have been prepared in conformity with the accounting principles reflected in, the consolidated financial statements and related notes included in PSI’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. As these financial statements have been prepared pursuant to the rules and regulations of the SEC, certain information and disclosures normally included in the financial statements and related notes prepared in accordance with GAAP have been condensed or omitted.
	Principles of consolidation
	The unaudited condensed consolidated financial statements presented herein include the accounts of Power Solutions International, Inc. and its direct and indirect wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
	Significant accounting policies
	The Company’s significant accounting policies as of December 31, 2013 are described in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 28, 2014. There have been no material changes with respect to the Company’s significant accounting policies subsequent to December 31, 2013, with the exception of goodwill and other intangibles. Management has adopted the following significant accounting policy based on the acquisition of PPPI (See Note 2, “Acquisition of Professional Power Products, Inc.” for further discussion).
	Goodwill and other intangibles
	Goodwill represents the excess of purchase price and related costs over the values assigned to the net tangible and identifiable intangible assets of businesses acquired. In accordance with ASC 350, Intangibles—Goodwill and Other Intangibles, goodwill is not amortized, but instead is tested for impairment annually, or more frequently if circumstances indicate a possible impairment may exist. Absent any interim indicators of impairment, the Company will test for goodwill impairment on a specified date of each year.
	In accordance with ASC 350, Intangibles—Goodwill and Other Intangibles, the Company amortizes its intangible assets with finite lives over their respective estimated useful lives and will review for impairment whenever impairment indicators exist. The Company’s intangible assets consist of backlog, customer relationships and trade names and trademarks.

Recently_issued_accounting_pro

Recently issued accounting pronouncements	6 Months Ended
	Jun. 30, 2014
Accounting Changes And Error Corrections [Abstract]	'
Recently issued accounting pronouncements	'
	4. Recently issued accounting pronouncements
	The Company evaluates the pronouncements of authoritative accounting organizations, including the Financial Accounting Standards Board (FASB), to determine the impact of new pronouncements on GAAP and the Company. In May of 2014, the FASB and International Accounting Standards Board jointly issued a final standard on revenue recognition which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. This standard will supersede most current revenue recognition guidance. Under the new standard, entities are required to identify the contract with a customer; identify the separate performance obligations in the contract; determine the transaction price; allocate the transaction price to the separate performance obligations in the contract; and recognize the appropriate amount of revenue when (or as) the entity satisfies each performance obligation. The standard is effective for fiscal years, and the interim periods within those years, beginning on or after January 1, 2017. Entities have the option of using either retrospective transition or a modified approach in applying the new standard. The Company is currently evaluating the approach it will use to apply the new standard and the impact that the adoption of the new standard will have on the Company’s unaudited condensed consolidated financial statements. Other than the final standard on revenue recognition, there were no new accounting pronouncements that have been issued or adopted during the three months ended June 30, 2014, that are expected to have a significant effect on the Company’s unaudited condensed consolidated financial statements.

Earnings_per_share

Earnings per share	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings per share	'
	5. Earnings per share
	The Company computes earnings (loss) per share by applying the guidance stated in ASC 260, Earnings per Share. The treasury stock method has been used to compute earnings (loss) per share. The Company has issued warrants (“Private Placement Warrants”) that represent the right to purchase shares of the Company’s common stock, stock appreciation rights (“SAR”), restricted stock and contingent consideration, all of which have been evaluated for their potentially dilutive effect under the treasury stock method. Refer to Note 22, “Stockholders’ equity” for a further description of the Private Placement Warrants, Note 11, “2012 Incentive compensation plan” for a further description of the SAR and restricted stock and Note 11, “Fair value of financial instruments”, for a further description of the contingent consideration.
	Computation of dilutive common shares
	The Company utilizes the treasury stock method described in ASC 260-10-55 to determine the number of treasury shares assumed to be purchased from the hypothetical proceeds of exercise, with any residual shares representing the incremental common shares to be issued and included in diluted EPS. As of June 30, 2014, the Company’s Private Placement Warrants, SAR, restricted stock and contingent consideration were evaluated for their potentially dilutive effect under the treasury stock method.
	As of June 30, 2013, the Company’s Private Placement Warrants, SAR and restricted stock were evaluated for their potentially dilutive effect. Due to the loss reported in the unaudited condensed consolidated statements of operations, any potentially issuable shares of Company common stock associated with the Private Placement Warrants, SAR and restricted stock were not included in the dilutive EPS calculation for the three or six months ended June 30, 2013. These potential shares were excluded from the diluted EPS calculation because they would have had an anti-dilutive effect under the treasury stock method.
	The computations of basic and diluted earnings (loss) per share for the three and six months ended June 30, 2014 and 2013, were as follows:
		Three months ended June 30,						Six months ended June 30,
		2014			2013			2014			2013
	Numerator:
	Net income (loss)	$	4,438		$	(2,100	)	$	6,812		$	(5,027	)
	Change in the value of Private Placement Warrants		(99	)		—			(332	)		—
			4,339			(2,100	)		6,480			(5,027	)
	Denominator:
	Weighted average common shares outstanding-basic		10,627,913			9,243,773			10,585,187			9,171,942
	Incremental shares from assumed exercise of Private Placement Warrants, SAR, restricted stock and contingent consideration		525,242			—			518,688			—
	Weighted average common shares outstanding-diluted		11,153,155			9,243,773			11,103,875			9,171,942
	Earnings (loss) per share of common stock – basic and diluted
	Earnings (loss) per share of common stock – basic	$	0.42		$	(0.23	)	$	0.64		$	(0.55	)
	Earnings (loss) per share of common stock – diluted	$	0.39		$	(0.23	)	$	0.58		$	(0.55	)

Inventories_net

Inventories, net	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
Inventories, net	'
	6. Inventories, net
	Inventories consist primarily of engines and parts. Engines are valued at the lower of cost, plus estimated freight-in, as determined by specific serial number identification, or market value. Parts are valued at the lower of cost (first-in, first-out) or market value. When necessary, the Company writes down inventory for an estimated amount equal to the difference between the cost of the inventory and the estimated realizable value. Additionally, an inventory reserve is recorded based upon the Company’s estimation of future demand for the quantity of inventory on hand. In determining an estimate of future demand, multiple factors are taken into consideration, including (i) customer purchase orders and customer forecasted demand; (ii) historical sales/usage for each inventory item; and (iii) utilization within a current or anticipated future power system.
	Inventory consisted of the following as of:
		June 30, 2014			December 31, 2013
	Raw material	$	74,399		$	53,528
	Work in process		2,566			1,446
	Finished goods		3,387			2,522
	Inventories		80,352			57,496
	Reserve		(1,754	)		(1,510	)
	Inventories, net	$	78,598		$	55,986

Property_plant_and_equipment_n

Property, plant and equipment, net	6 Months Ended
	Jun. 30, 2014
Property Plant And Equipment [Abstract]	'
Property, plant and equipment, net	'
	7. Property, plant and equipment, net
	The components of property, plant and equipment are recorded at cost and included the following as of:
		June 30, 2014			December 31, 2013
	Land	$	260		$	260
	Buildings and improvements		4,965			4,125
	Office furniture and equipment		3,347			2,723
	Tooling and equipment		11,217			7,595
	Transportation equipment		470			203
	Construction in progress		5,582			4,844
	Property, plant and equipment, at cost		25,841			19,750
	Accumulated depreciation		(7,302	)		(6,646	)
	Property, plant and equipment, net	$	18,539		$	13,104

Fair_value_of_financial_instru

Fair value of financial instruments	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair value of financial instruments	'
	8. Fair value of financial instruments
	As of June 30, 2014, and December 31, 2013, the Company measured its financial assets and liabilities under the amended ASC Topic 820, Fair Value Measurements and Disclosures of the Accounting Standards Codification, which defines fair value as the price that would be received to sell an asset or paid to transfer a liability (i.e., exit price) in an orderly transaction between market participants at the measurement date. It also establishes a three-level valuation hierarchy for disclosures of fair value measurement as follows:
	Level 1 — quoted prices in active markets for identical assets or liabilities;
	Level 2 — other significant observable inputs for the assets or liabilities through corroborations with market data at the measurement date; and
	Level 3 — significant unobservable inputs that reflect management’s best estimate of what market participants would use to price the assets or liabilities at the measurement date.
	Private placement warrants liability
	As of June 30, 2014, and December 31, 2013, the Company’s Private Placement Warrants were measured at fair value under ASC Topic 820. The Company’s liability for the Private Placement Warrants is measured at fair value based on unobservable inputs, and thus is considered a Level 3 financial instrument. The Company analyzes financial instruments with features of both liabilities and equity under ASC 480, Distinguishing Liabilities from Equity and ASC 815, Derivatives and Hedging.
	As of June 30, 2014, and December 31, 2013, the Company estimated the fair value of its Private Placement Warrants with a publicly traded stock pricing approach using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the following:
		June 30, 2014			December 31, 2013
	Market value of the Company’s common stock	$	71.97		$	75.1
	Exercise price	$	13		$	13
	Risk-free interest rate		0.41	%		0.51	%
	Estimated price volatility		42.5	%		42.5	%
	Contractual term		1.83 years			2.33 years
	Dividend yield		—			—
	The market value of the Company’s common stock was based on its closing price on June 30, 2014, and December 31, 2013, the date of each valuation. The volatility factors noted above represented the upper end of the range of implied volatility of publicly traded call options of benchmark companies. If all other assumptions were held constant, the recorded liability of the Private Placement Warrants would increase or decrease by approximately $1.7 million due to a 10% change in the value of these warrants based on the Black-Scholes option pricing model.
	The following table summarizes the change in the estimated fair value of the Company’s Level 3 Private Placement Warrants liability in the six months ended June 30, 2014:
	Balance at December 31, 2013	$	24,525
	Fair value of private placement warrants exercised		(7,320	)
	Change in the value of private placement warrants		(332	)
	Balance at June 30, 2014	$	16,873
	For the three and six months ended June 30, 2014, the Company recognized income of $99,000 and $332,000, respectively, due to a decrease in the estimated fair value of the Company’s Private Placement Warrants. For the three and six months ended June 30, 2013, the Company recognized expense of $4,207,000 and $9,053,000, respectively, due to an increase in the estimated fair value of the Company’s Private Placement Warrants. This (income) expense was recorded as “Private placement warrant (income) expense” in the Company’s unaudited condensed consolidated statements of operations for the respective periods.
	Contingent consideration liability
	As described in Note 2, “Acquisition of Professional Power Products, Inc.” a portion of the purchase price for the acquisition of PPPI is in the form of contingent consideration payable in shares of the Company’s common stock. As of June 30, 2014, the Company’s potential contingent consideration payment relating to its acquisition of PPPI was measured at fair value under ASC Topic 820. The Company analyzes financial instruments with features of both liabilities and equity under ASC 480, Distinguishing Liabilities from Equity and ASC 815, Derivatives and Hedging. The Company’s liability for the contingent consideration is measured at fair value based on unobservable inputs, and thus is considered a Level 3 financial instrument. The fair value of the liability determined by this analysis is primarily driven by the Company’s expectations of achieving the performance measures required by the Stock Purchase Agreement, the resulting shares expected to be issued, and the share price of the Company’s common stock. The expected performance metrics and resulting shares expected to be issued are estimated based on a Monte Carlo simulation model considering actual and forecasted results over the measurement period.
	As of June 30, 2014, the primary inputs of the Monte Carlo simulation model included the following:
		June 30, 2014
	Market value of the Company’s common stock	$	71.97
	Estimated EBITDA volatility		42.5	%
	The market value of the Company’s common stock was based on its closing price on June 30, 2014, the date of the valuation. The volatility factor was primarily derived from the implied volatility of publicly traded call options of benchmark companies, with consideration of the implied enterprise value volatility, the relationship to EBITDA, and other pertinent factors. If all other assumptions were held constant, a five percentage point decrease in the volatility factor would result in an increase in the fair value of the contingent consideration by approximately $50,000.
	The following table summarizes the change in the estimated fair value of the Company’s Level 3 contingent consideration liability in the six months ended June 30, 2014:
	Balance at April 1, 2014	$	8,900
	Change in the value of contingent consideration		(900	)
	Balance at June 30, 2014	$	8,000
	For the three months ended June 30, 2014, the Company recognized income of $900,000, due to a decrease in the estimated fair value of the Company’s Contingent consideration liability. This income was recorded as “Contingent consideration” in the Company’s unaudited condensed consolidated statements of operations for the respective period.
	Financial liabilities measured at fair value
	The following table summarizes fair value measurements by level as of June 30, 2014, for the Company’s level 3 financial liabilities measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	16,873
	Contingent consideration		—			—		$	8,000
	The following table summarizes fair value measurement by level as of December 31, 2013, for the Company’s level 3 financial liability measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	24,525
	Financial assets and liabilities not measured at fair value
	As of June 30, 2014, and December 31, 2013, the Company’s revolving line of credit and term debt, including accrued interest, recorded on the unaudited condensed consolidated balance sheets were carried at cost. The carrying value of the revolving line of credit and term debt approximate fair value because the interest rates fluctuate with market interest rates or the fixed rates approximate current rates offered to the Company for debt with similar terms and maturities, and the Company’s credit profile has not changed significantly since the origination of these financial liabilities. Under ASC Topic 825, Financial Instruments, these financial liabilities are defined as Level 2 in the three-level valuation hierarchy, as the inputs to their valuation are market observable.

Revolving_line_of_credit_and_t

Revolving line of credit and term loan	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Revolving line of credit and term loan	'
	9. Revolving line of credit and term loan
	On June 28, 2013, the Company entered into a credit agreement with Wells Fargo Bank, National Association, (the “Wells Credit Agreement”), which replaced its prior credit agreement with BMO Harris Bank N.A. (“BMO Bank”) (the “Amended Harris Agreement II”) as described below. The Wells Credit Agreement enabled the Company to borrow under a revolving line of credit secured by substantially all of the Company’s tangible and intangible assets (other than real property). The Wells Credit Agreement (a) provided an initial maximum $75.0 million revolving line of credit to the Company, which, at the Company’s request and subject to the terms of the Wells Credit Agreement, could have been increased up to $100.0 million during the term of the Wells Credit Agreement; (b) bore interest at the Wells Fargo Bank’s prime rate plus an applicable margin ranging from 0% to 0.50%; or at the Company’s option, all or a portion of the revolving line of credit could have been designated to bear interest at LIBOR plus an applicable margin ranging from 1.50% to 2.00%; (c) had an unused line fee of 0.25% and (d) required the Company to report its fixed charge coverage ratio, when its Availability (as defined in the Wells Credit Agreement) was less than the Threshold Amount (as defined in the Wells Credit Agreement) and to continue to report its fixed charge coverage ratio until the date that Availability for a period of 60 consecutive days, was greater than or equal to the Threshold Amount. The Company was required to meet a minimum monthly fixed charge coverage ratio of not less than 1.0 to 1.0, the testing of which commenced on the last day of the month prior to the date on which its Availability was less than the Threshold Amount. The Threshold Amount was defined in the Wells Credit Agreement as the greater of (i) $9,375,000 or (ii) 12.5% of the maximum revolver amount of $75.0 million or as it may have been increased during the term of the Wells Credit Agreement up to $100.0 million.
	On April 1, 2014, the Wells Credit Agreement was amended (the “Amended Wells Credit Agreement”) to increase the Company’s revolving line of credit from $75.0 million to $90.0 million. The Amended Wells Credit Agreement (a) bears interest at the Wells Fargo Bank’s prime rate plus an applicable margin ranging from 0% to 0.5%; or at the Company’s option, all or a portion of the revolving line of credit can be designated to bear interest at LIBOR plus an applicable margin ranging from 1.50% to 2.00%; (b) has an unused line fee of 0.25%; (c) requires the Company to report its fixed charge coverage ratio and leverage ratio as described below; (d) includes a $5.0 million term loan arrangement with Wells Fargo; and (e) includes a letter of credit subfacility of the revolving line of credit. The principal amount of the $5.0 million term loan is payable in 36 equal monthly installments with the first payment due on June 1, 2014, plus interest at LIBOR plus 4.5%. As of June 30, 2014, the LIBOR rate on the term loan was 0.16%. The term loan may be paid in whole or in part at any time after June 30, 2014 upon at least 10 business days prior notice. Effective April 1, 2014 and during the period in which the term loan is outstanding, the Company is subject to a fixed charge coverage ratio covenant and a debt leverage ratio covenant. The Company is required to maintain a fixed charge coverage ratio of at least 1.20 to 1.00 and the Company’s debt leverage ratio may not exceed 4.0 to 1.0 during the period in which the term loan is outstanding. The Company used borrowings under the expanded revolving line of credit as well as the proceeds from the term loan to finance the acquisition of PPPI which was consummated on April 1, 2014 as described in Note 2, “Acquisition of Professional Power Products, Inc.”
	Other than the above mentioned amendment, the terms and conditions of the Amended Wells Credit Agreement are substantially similar to the Wells Credit Agreement. Under the Amended Wells Credit Agreement, the amount that the Company may borrow is limited to the lesser (i) of the maximum available amount and (ii) borrowing base. The borrowing base is calculated as a percentage of the Company’s eligible accounts receivable and eligible inventory, plus a defined amount based upon certain of the Company’s fixed assets (all as defined in the Amended Wells Credit Agreement). The Amended Wells Credit Agreement also contains customary covenants and restrictions applicable to the Company, including agreements to provide financial information, comply with laws, pay taxes and maintain insurance, restrictions on the incurrence of certain indebtedness, guarantees and liens, restrictions on mergers, acquisitions and certain dispositions of assets, and restrictions on the payment of dividends and distributions. The revolving line of credit is secured by substantially all of the Company’s tangible and intangible assets (other than real property). The Amended Wells Credit Agreement is scheduled to mature on June 28, 2018.
	The Amended Harris Agreement II was a loan and security agreement entered into with BMO Bank on April 29, 2011 and subsequently amended on March 20, 2012 and again on November 8, 2012, and replaced on June 28, 2013. The Amended Harris Agreement II was a $50.0 million credit facility with a maturity date of March 20, 2017. Under the terms of the Amended Harris Agreement II: (a) the revolving line of credit bore interest at BMO Bank’s prime rate plus an applicable margin ranging from 0% to 0.50%; or, at the Company’s option, all or a portion of the revolving line of credit could have been designated to bear interest at LIBOR plus an applicable margin ranging from 1.75% to 2.25%; (b) the unused revolving line fee was 0.25%; and (c) the Company was only required to report its compliance with the fixed charge coverage ratio for any month when the Company’s Excess Availability, (as defined in the Amended Harris Agreement II), was less than the Liquidity Threshold. The Liquidity Threshold was defined in the Amended Harris Agreement II as the greater of (i) $7.5 million or (ii) 12.5% of the total credit facility of $50.0 million, as may have been reduced from time to time pursuant to the terms of the Amended Harris Agreement II.
	As of June 30, 2014, $69.0 million of the Company’ outstanding borrowings under its revolving line of credit bore interest at the LIBOR rate, plus an applicable margin. The weighted average interest rate on these borrowings was 1.65% as of June 30, 2014. The remaining outstanding balance of $1.1 million as of June 30, 2014, had been designated to bear interest at the prime rate, plus an applicable margin, which equaled 3.25% with the applicable margin included. The unused and available revolving line of credit balance was $19.4 million at June 30, 2014. As of June 30, 2014, the Company had approximately $4.9 million outstanding under the term loan, which bore interest at LIBOR plus 4.5%, which equaled 4.66% with the applicable margin included.
	As of December 31, 2013, $9.0 million of the Company’s outstanding borrowings under its revolving line of credit bore interest at the LIBOR rate, plus an applicable margin, which equaled 1.67%. The remaining outstanding balance of $8.9 million as of December 31, 2013, bore interest at the prime rate, which equaled 3.25% with the applicable margin included. The unused and available revolving line of credit balance was $47.9 million at December 31, 2013.

Income_taxes

Income taxes	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income taxes	'
	10. Income taxes
	At the end of each interim period, the Company applies its estimated annual effective tax rate (“ETR”) to its interim earnings before considering the tax effect of any discrete items. The Company also records the tax impact of certain unusual or infrequently occurring items, including the effects of changes in valuation allowances and tax laws or rates, in the interim period in which they occur. Any penalties and/or interest incurred in connection with the payment of the Company’s income tax obligations are classified within general and administrative expense and interest expense, respectively.
	The computation of the estimated annual ETR for each interim period requires certain estimates and significant judgments, including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in state jurisdictions, estimates of permanent and temporary differences, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained, or the tax environment changes. For the 2014 fiscal year, the Company’s estimated annual ETR is 37.0%, which excludes the impact of changes in the valuation of the Private Placement Warrants and the contingent consideration liability, as such amounts are excluded from the calculation of taxable income. Given the subjectivity and volatility of the valuation of the Private Placement Warrants, it is not possible to project the impact of the change in the Private Placement Warrants in the computation of the Company’s estimated annual ETR. As a result, the Company’s reported ETR will differ from the estimated annual ETR due to the changes in the valuation of the Private Placement Warrants in the periods in which such changes occur. The income recognized as a result of a change in the value of the contingent consideration liability is also a non-taxable transaction and the Company’s reported ETR will differ from the estimated annual ETR due to changes in the valuation of the contingent consideration in the periods in which such changes occur. Accordingly, the Company’s reported income tax rate was 32.5% for the six months ended June 30, 2014, reflecting the effects on income of the changes in the Private Placement Warrant liability and contingent consideration liability. For the six months ended June 30, 2013, the Company reported a pre-tax loss. The pre-tax loss was attributable to the expense recognized from a change in the valuation of the Private Placement Warrants during the period, which amount, as noted above, is permanently excluded from the computation of taxable income. As such, the Company’s reported income tax rate was not meaningful for the six months ended June 30, 2013.
	Excluding the impact of the changes in the valuation of the Private Placement Warrants and the change in the value of the contingent consideration liability, on results of operations, the Company’s reported effective income tax rates would have been 37.0% and 35.4% in the six months ended June 30, 2014 and 2013, respectively.

2012_Incentive_compensation_pl

2012 Incentive compensation plan	6 Months Ended
	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
2012 Incentive compensation plan	'
	11. 2012 Incentive compensation plan
	On May 30, 2012, the Board of Directors of the Company approved and adopted the Company’s 2012 Incentive Compensation Plan (the “2012 Plan”), and the 2012 Plan was approved by a majority of the Company’s stockholders at the Company’s annual meeting held on August 29, 2012. The 2012 Plan is administered by the Compensation Committee of the Board of Directors, which consists only of independent, non-employee directors.
	The 2012 Plan is a broad-based plan which allows for a variety of different types of awards, including (but not limited to) non-qualified stock options, incentive stock options, SAR, restricted stock, deferred stock and performance units, to be made to the Company’s executive officers, employees, consultants and directors. The 2012 Plan is intended to assist the Company in attracting and retaining exceptionally qualified employees, consultants and directors to support the sustained progress, growth and profitability of the Company.
	Under the 2012 Plan, 830,925 shares of the Company’s common stock were initially made available for awards pursuant to the 2012 Plan. On July 31, 2013, the Board of Directors of the Company, upon recommendation of the Compensation Committee, adopted an amendment to the 2012 Plan to increase the number of shares of common stock available for issuance under the 2012 Plan by 700,000 shares. This amendment was approved by a majority of the Company’s stockholders at the Company’s annual meeting of stockholders held on August 28, 2013. Of the Company’s 1,530,925 shares reserved for awards under the 2012 Plan, 543,872 shares were originally underlying a SAR award granted to the Company’s Chief Operating Officer on June 6, 2012 and 174,993 shares of restricted stock have been granted as of June 30, 2014 to eligible employees (as further described below). As of June 30, 2014, the Company had 812,060 shares of common stock available for future issuance under the 2012 Plan.
	SAR award agreement
	On June 6, 2012 (the “SAR Grant Date”), the Compensation Committee of the Board of Directors approved, and the Company granted, a SAR to the Company’s Chief Operating Officer (“Grantee”), pursuant to the 2012 Plan and a Stock Appreciation Rights Award Agreement (“SAR Award Agreement”), dated as of the SAR Grant Date. The SAR granted to the Grantee covers an aggregate of 543,872 shares of Company common stock and is exercisable only in whole shares at a price per share of $22.07. The SAR expires on the tenth anniversary of the SAR Grant Date.
	The SAR granted to the Grantee vests and becomes exercisable ratably on each of the first three anniversaries of the SAR Grant Date (“graded vesting”). In addition, the SAR did not become exercisable until the date that was the last of any seven Valuation Dates (as defined in the SAR Award Agreement) within any period of ten or fewer consecutive Valuation Dates that commenced after the SAR Grant Date and prior to the expiration date on each of which the market value per share of Company common stock was at least $22.07. This market condition was met during the year ended December 31, 2013.
	The SAR entitles the Grantee to receive, upon any exercise, a number of shares of the Company’s common stock equal to (i) the number of shares for which the SAR is being exercised multiplied by the value of one share of the Company’s common stock on the date of exercise (determined as provided in the SAR Award Agreement), (ii) less the number of shares for which the SAR is being exercised multiplied by $22.07, (iii) divided by the value of one share of the Company’s common stock on the date of exercise (determined as provided in the SAR Award Agreement). The exercised SAR is to be settled only in whole shares of the Company’s common stock, and the value of any fractional share of the Company’s common stock will be forfeited.
	The SAR is accounted for as equity, in accordance with ASC 718, Compensation — Stock Compensation, which states that options or similar instruments on shares shall be classified as liabilities if either the underlying shares are classified as liabilities or the entity can be required under any circumstance to settle the option or similar instrument by transferring cash or other assets. The Company’s underlying shares are classified as equity, and under the terms of the SAR Award Agreement, the Company must settle the exercised portion of the SAR in shares of the Company’s common stock. As such, the Company has accounted for the SAR as equity.
	As of the SAR Grant Date, the fair value of the SAR was estimated using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the fair value of the Company’s common stock, exercise price, risk-free interest rate, estimated price volatility, term and dividend yield. Due to the limited trading activity in the Company’s common stock at the date of issuance of the SAR, the fair value of the Company’s common stock was established through multiple valuation techniques, including (a) the income approach in the form of the discounted cash flow method and (b) the market approach in the form of (i) the guideline public company method and (ii) the merger and acquisition method. After the fair value of the equity was determined, it was then allocated to the SAR using the Option Pricing Method. In addition to that described above, other assumptions used in the Black-Scholes method included the following as of the SAR Grant Date: an expected term of 6.0 years, a risk-free interest rate of 0.92%, an anticipated volatility factor of 55.0% and a zero dividend yield. The resulting valuation as of the SAR Grant Date, was discounted by 15%, reflecting an assessment of the then trading activity of the Company’s common stock (and by extension the SAR). The suggested value from the Black-Scholes method reflected a fully marketable security that was not burdened by limited marketability; however, at that time, the Company’s common stock (and by extension the SAR) did not have regular trading activity. Therefore, the Company considered it necessary to incorporate a discount to reflect the limited liquidity associated with the SAR. This approach was consistent with that utilized to value the Company’s Private Placement Warrants at that time. The resulting fair value of the SAR granted was $3.31 per underlying share.
	ASC 718, Compensation — Stock Compensation, was utilized in order to estimate the fair value of the SAR. The term “fair value” has been defined in Note 8, “Fair value of financial instruments.” ASC 718 requires an entity to measure the cost of employee services received in exchange for an award of equity instruments based on the fair value of the award as of the grant date. That cost is then recognized over the period during which an employee is required to provide service in exchange for the award. ASC 718-10-55-72 provides that, if vesting (or exercisability) of an award is based on satisfying both a market condition and a performance or service condition and it is probable that the performance or service condition will be satisfied, the initial estimate of the service period is the longest of the explicit, implicit or derived service period. The Company has computed compensation expense by applying the guidance stated in ASC 718, on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in-substance, multiple awards (graded vesting attribution method). Since, as noted above, the SAR granted by the Company includes both a market and service condition, the Company used the longest of the periods to define its requisite service period in each separately vesting portion or tranche. To determine the derived service period associated with the SAR’s market condition, the Company performed a Monte Carlo analysis in order to estimate the likely timeframe until the Company’s public equivalent value would exceed its aggregate exercise price over a period of seven days within a period of 10 or fewer trading days (i.e. the value at which the per share value of the Company’s equity exceeds $22.07). Based on the results of this analysis, the derived service period associated with the SAR’s market condition was determined to be 1.78 years. Thus, compensation expense for the first tranche was computed on a straight-line basis over the derived service period of 1.78 years. The second and third tranches were computed on a straight-line basis over the explicit service period.
	During the six months ended June 30, 2014, the Grantee exercised a portion of the shares that vested on June 6, 2014. During the year ended December 31, 2013, the Grantee fully exercised the portion of shares that vested on June 6, 2013. The impact of this transaction on the Company’s issued capital is described in Note 12, “Stockholders’ equity.”
	In the three and six months ended June 30, 2014, the Company recognized $105,000 and $228,000, respectively, of expense related to the SAR. In the three and six months ended June 30, 2013, the Company recognized $450,000 and $657,000, respectively, of expense related to the SAR. As of June 30, 2014, there was $187,000 of total unrecognized compensation expense related to the SAR granted under the Plan. The total SAR expense is expected to be approximately $1,800,000. The Company expects the remaining SAR expense to continue to be recognized over the next twelve months.
	Restricted stock awards
	The Compensation Committee of the Board of Directors has approved, and the Company granted, shares of Company restricted stock (“Restricted Stock”) to various employees pursuant to the 2012 Plan and subject in each case to a Restricted Stock Award Agreement (“Restricted Stock Award Agreement”). Restricted stock activity consisted of the following for the six months ended June 30, 2014:
		Shares		Weighted Average Grant Date
				Fair Value
	31-Dec-13		162,993	$	39.29
	Granted		12,000		76.93
	Forfeited		3,000		51.91
	Vested		15,227		37.61
	30-Jun-14		156,766	$	42.1
	These shares of Restricted Stock vest in various increments and periods over a maximum of ten years from the date the stock was granted as defined under the applicable Restricted Stock Award Agreement. In the three and six months ended June 30, 2014, the Company recognized approximately $237,000 and $435,000, respectively, of compensation expense in connection with the Restricted Stock granted under the 2012 Plan. In the three and six months ended June 30, 2013, the Company recognized approximately $18,000 of compensation expense in connection with the Restricted Stock granted under the 2012 Plan. As of June 30, 2014, there was approximately $6,376,000 of total unrecognized compensation expense related to the Restricted Stock granted under the 2012 Plan. As of June 30, 2014, the weighted-average period over which the unrecognized compensation cost is expected to be recognized is approximately 8 years.

Stockholders_equity

Stockholders' equity	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Stockholders' equity	'
	12. Stockholders’ equity
	The Company’s equity securities and the Private Placement Warrants are described below.
	Series A Convertible preferred stock
	The Company has authorized 114,000 shares of Series A Convertible preferred stock with a par value of $0.001 per share. As of June 30, 2014, and December 31, 2013, no shares of Series A Convertible preferred stock of the Company were issued or outstanding.
	Common stock
	The Company has authorized 50,000,000 shares of common stock with a par value of $0.001 per share. As of June 30, 2014, issued shares and outstanding shares of the Company’s common stock were 11,559,147 and 10,728,222, respectively. At December 31, 2013, issued shares and outstanding shares of the Company’s common stock were 11,352,812 and 10,521,887, respectively. Each holder of a share of the Company’s common stock is entitled to one vote per share held on each matter to be considered by holders of the Company’s common stock. Holders of the Company’s common stock are entitled to receive ratably such dividends, if any, as may be declared by the Company’s board of directors. The Company’s current policy is to retain earnings for operations and growth. Upon any liquidation, dissolution or winding-up of the Company, the holders of the Company’s common stock are entitled to share ratably in all assets available for distribution, after payment of, or provision for, all liabilities and the preferences of any then outstanding shares of Company preferred stock. The holders of the Company’s common stock have no preemptive, subscription, redemption or conversion rights.
	Underwritten public offering
	On July 16, 2013, the Company closed an underwritten public offering of 2,005,000 shares of its common stock at a price to the public of $35.00 per share. The Company sold 1,050,000 shares of its common stock, and certain selling stockholders sold 955,000 shares of Company common stock in the offering. The proceeds to the Company, net of the underwriter’s fees and expenses, were $34,530,000 before deducting offering expenses of approximately $514,000 paid by the Company. The Company did not receive any proceeds from the sale of the shares by the selling stockholders.
	SAR exercise for shares of Company common stock
	The Company granted a SAR to the Grantee on June 6, 2012 as further described in Note 11, “2012 Incentive compensation plan.” On August 15, 2013, the Grantee exercised the SAR with respect to 181,291 shares of common stock, which was the then vested portion of the SAR. Upon such exercise, the Company initially issued 96,504 shares of the Company’s common stock.
	During the six months ended June 30, 2014, the Grantee exercised the SAR with respect to 120,000 of the 181,291 shares of common stock underlying the SAR, the aggregate amount of which vested on June 6, 2014. The Company issued a total of 85,903 shares of the Company’s common stock in two exercises. In connection with these exercises, the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements is a cost that is deductible for income tax purposes. As such, the Company realized an income tax benefit of $2,248,000 for this incremental amount, which was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital as of June 30, 2014. As of June 30, 2014, 61,291 shares under the SAR that vested on June 6, 2014 remain unexercised.
	Restricted stock vesting for shares of Company common stock
	The Compensation Committee of the Board of Directors approved, and the Company granted, shares of Restricted Stock to various employees pursuant to the 2012 Plan and subject to a Restricted Stock Award Agreement as further described in Note 11, “2012 Incentive compensation plan.” As of June 30, 2014, various individuals’ awards vested resulting in the net issuance of 10,847 shares. Under the terms of the 2012 Plan, at the option of certain of those vested restricted stock participants, the Company withheld shares issued to satisfy the income tax obligations of these participants. The cash equivalent of the aggregate number of shares withheld was $340,000, representing the income tax withholding obligations of the participants, which was remitted by the Company to the applicable taxing authorities. The payment of the income tax withholding obligation was recorded as a reduction in additional paid-in-capital as of June 30, 2014.
	In connection with this vesting, the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements is a cost that is deductible for income tax purposes. As such, the Company realized an income tax benefit of $214,000 for this incremental amount which was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital as of June 30, 2014.
	Private placement warrants
	In connection with a private placement (“Private Placement”) on April 29, 2011, investors in the Private Placement received Company preferred stock (which subsequently converted to shares of Company common stock) and Private Placement Warrants. The Private Placement Warrants represented the right to purchase a total of 750,002 shares of the Company’s common stock at an exercise price of $13.00 per share, subject to further adjustment for non-cash dividends, distributions, stock splits or other reorganizations or reclassifications of the Company’s common stock. The Private Placement Warrants are also subject to full ratchet anti-dilution protection whereby, upon the issuance (or deemed issuance) of shares of the Company’s common stock at a price below the then-current exercise price of the Private Placement Warrants, subject to specified exceptions, the exercise price of the Private Placement Warrants will be reduced to the effective price of the Company’s common stock so issued (or deemed to be issued). The Private Placement Warrants will expire on April 29, 2016.
	At any time beginning six months after the closing of the Private Placement at which the Company is required to register the shares issuable upon exercise of the Private Placement Warrants pursuant to the registration rights agreement entered into in connection with the Private Placement, but such shares may not be freely sold to the public, the Private Placement Warrants may be “cashlessly” exercised by their holders. In such circumstances, the warrant holders may “cashlessly” exercise the Private Placement Warrants by causing the Company to withhold a number of shares of its common stock otherwise issuable upon such exercise having a value, based upon the market price of the Company’s common stock (such market price as defined in the purchase agreement for the Private Placement), equal to the aggregate exercise price associated with such exercise. In other words, in such circumstances, the exercise of the Private Placement Warrants will occur without any cash being paid by the holders of the Private Placement Warrants. Because the shares issuable upon exercise of the Private Placement Warrants are currently available for resale pursuant to effective registration statements filed by the Company with the SEC, the Private Placement Warrants may not be “cashlessly” exercised at this time. The Private Placement Warrants further include a requirement that, the Company will keep reserved out of the authorized and unissued shares of its common stock sufficient shares to provide for the exercise of the Private Placement Warrants.
	The Company’s Private Placement Warrants are accounted for as a liability, in accordance with ASC 480, Distinguishing Liabilities from Equity. ASC 480 states that, if an entity must or could settle an instrument by issuing a variable number of its own shares, and, as in this case, the obligation’s monetary value is based solely or predominantly on variations in the fair value of the company’s equity shares, but moves in the opposite direction, then the obligation to issue shares is to be recorded as a liability at the inception of the arrangement, and is adjusted with subsequent changes in the fair value of the underlying stock. The effect of the change in value of the obligation is reflected as “Private placement warrant expense” in the Company’s consolidated statements of operations.
	See Note 8, “Fair value of financial instruments,” for detail describing the valuation approach for the Private Placement Warrants as of June 30, 2014 and December 31, 2013.
	During the three and six months ended June 30, 2014, a portion of the Private Placement Warrants were exercised, resulting in the issuance of 69,333 and 109,585 shares of the Company’s common stock, respectively. During the three and six months ended June 30, 2013, a portion of the Private Placement Warrants were exercised, resulting in the issuance of 70,833 and 209,167 shares of the Company’s common stock, respectively.
	As of June 30, 2014 and December 31, 2013, shares of Company common stock, reserved for the exercise of the outstanding Private Placement Warrants, in accordance with the terms of the purchase agreement for the Private Placement were 287,257 shares and 396,842, respectively.
	Registration rights agreement
	In connection with the Private Placement, the Company entered into a Registration Rights Agreement (the “Private Placement Registration Rights Agreement”) with the investors in the Private Placement and Roth Capital Partners, LLC, pursuant to which it agreed to file a registration statement on Form S-1, with the SEC, covering the resale of “Registrable Securities” (as defined below) (which includes the shares of the Company’s common stock that were issuable upon conversion of shares of the Company’s preferred stock originally issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and shares of the Company’s common stock that were issuable upon exercise of a warrant issued to Roth Capital Partners, LLC). The Company further agreed, within 30 days after it becomes eligible to use a registration statement on Form S-3 to register the Registrable Securities for resale, to file a registration statement on Form S-3 covering the Registrable Securities. On June 27, 2013, within 30 days after the Company became eligible to use a registration statement on Form S-3, in accordance with the Private Placement Registration Rights Agreement, it filed a registration statement on Form S-3 (as a post-effective amendment to the registration statement on Form S-1) covering the Registrable Securities, which was declared effective on June 27, 2013.
	The Company is obligated to maintain the effectiveness of the registration statement until the earliest of (1) the first date on which all Registrable Securities covered by such registration statement have been sold, (2) the first date on which all Registrable Securities covered by such registration statement may be sold without restriction pursuant to Rule 144 or (3) the first date on which none of the securities included in the registration statement constitute Registrable Securities.
	Pursuant to the Private Placement Registration Rights Agreement, the holders of Registrable Securities are also entitled to certain piggyback registration rights if the Registrable Securities are not covered by one or more effective registration statements. As of June 30, 2014, and as of the time of the closing of the public offering on July 16, 2013, all of the Registrable Securities were covered by an effective registration statement. “Registrable Securities,” as contemplated by the Private Placement Registration Rights Agreement, means certain shares of the Company’s common stock, including those shares that were issuable upon conversion of shares of Company preferred stock issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and the shares of the Company’s common stock that were issued upon exercise of the Roth Warrant; provided, that, any such share shall cease to be a Registrable Security upon (A) sale pursuant to the registration statement or Rule 144 under the Securities Act, (B) such share becoming eligible for sale without restriction by the selling securityholder holding such security pursuant to Rule 144 under the Securities Act or (C) such share otherwise becoming eligible for sale without restriction pursuant to Section 4(1) of the Securities Act, provided that, any restrictive legend on any certificate or other instrument representing such shares has been removed or there has been delivered to the transfer agent for such shares irrevocable documentation (including any necessary legal opinion) to the effect that, upon submission by the applicable selling securityholder of the certificate or instrument representing such security, any such restrictive legend shall be removed. See Note 13, “Commitments and contingencies,” below.
	In connection with the consummation of the Reverse Recapitalization, the Company also entered into a registration rights agreement with the former stockholders of The W Group, pursuant to which it agreed to provide to such persons certain piggyback registration rights with respect to shares of the Company’s capital stock, including shares issuable upon exercise, conversion or exchange of securities, held by such persons at any time on or after the closing of the Reverse Recapitalization. The piggyback registration rights under this registration rights agreement are subject to customary cutbacks and are junior to the piggyback registration rights granted to investors in the Private Placement and to Roth pursuant to the Private Placement Registration Rights Agreement.
	Shelf registration
	The Company filed a universal $150 million shelf registration statement, which was declared effective on February 14, 2014, pursuant to which the Company may offer, issue and sell, from time to time, in one or more offerings, common stock, preferred stock, debt securities, depositary shares, warrants, subscription rights, stock purchase contracts and units.

Commitments_and_contingencies

Commitments and contingencies	6 Months Ended
	Jun. 30, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and contingencies	'
	13. Commitments and contingencies
	The Private Placement Registration Rights Agreement provides, among other things, that if, after a registration statement registering the shares issuable on exercise of the Private Placement Warrants has been declared effective by the SEC, sales cannot be made pursuant to such registration statement for any reason, but excluding any period for which the use of any prospectus included in a registration statement has been suspended if and so long as certain conditions exist (which period may not be for more than 20 consecutive days or for a total of more than 45 days in any 12-month period), then the Company would be required to pay each investor 1.5% of the aggregate amount invested by such investor for each 30-day period (or pro rata for any portion thereof) following the date by which such registration statement was unavailable.
	The Company is involved in various legal proceedings from time to time arising in the normal course of doing business. The Company is required to record a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated; however, based upon a review of information currently available to the Company regarding the potential impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to the legal proceedings in which the Company is currently involved, the resolution of these legal proceedings, either individually or in the aggregate, is not expected to have a material effect on the Company’s consolidated results of operations, financial condition or cash flows.
	On December 7, 2012, the Company signed an agreement to enter into a joint venture with another entity for the purpose of manufacturing, assembling and selling certain engines into the Asian markets. As of June 30, 2014, the production facility was complete and manufacturing has been scheduled to commence during 2014. In connection with this agreement, the Company has committed up to $1.2 million toward the joint venture of which $850,000 and $500,000 has been contributed as of June 30, 2014 and December 31, 2013, respectively.

Related_party_transaction

Related party transaction	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Related party transaction	'
	14. Related party transaction
	In connection with the acquisition of Professional Power Products, Inc., the Company entered into a lease agreement effective April 1, 2014, with a limited liability company in which one of the former owners of PPPI is the sole member. The lease is for the land, buildings and certain equipment located at PPPI’s facilities in Darien, Wisconsin. The initial term of the lease is for seven years through March 31, 2021 and the initial annual base rent is $480,000 annually which is payable in equal monthly installments. The base rent is subject to annual increases as defined in the lease agreement. In the three months ended June 30, 2014, the Company recognized expense of $120,000 in connection with this lease. See Note 2, “Acquisition of Professional Power Products, Inc.” for further discussion of the acquisition.

Basis_of_presentation_Policies

Basis of presentation (Policies)	6 Months Ended
	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Unaudited condensed consolidated financial statements	'
	Unaudited condensed consolidated financial statements
	The unaudited condensed consolidated financial statements of Power Solutions International, Inc. present information in accordance with generally accepted accounting principles in the U.S. (“GAAP”), have been prepared pursuant to the rules and regulations of the SEC and, in the opinion of management, reflect all normal and recurring adjustments necessary to present fairly the interim periods of the unaudited condensed consolidated financial position, results of operations and cash flows of the Company and its wholly-owned subsidiaries for the periods presented.
	These unaudited condensed consolidated financial statements should be read in conjunction with, and have been prepared in conformity with the accounting principles reflected in, the consolidated financial statements and related notes included in PSI’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. As these financial statements have been prepared pursuant to the rules and regulations of the SEC, certain information and disclosures normally included in the financial statements and related notes prepared in accordance with GAAP have been condensed or omitted.
Principles of consolidation	'
	Principles of consolidation
	The unaudited condensed consolidated financial statements presented herein include the accounts of Power Solutions International, Inc. and its direct and indirect wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Significant accounting policies	'
	Significant accounting policies
	The Company’s significant accounting policies as of December 31, 2013 are described in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 28, 2014. There have been no material changes with respect to the Company’s significant accounting policies subsequent to December 31, 2013, with the exception of goodwill and other intangibles. Management has adopted the following significant accounting policy based on the acquisition of PPPI (See Note 2, “Acquisition of Professional Power Products, Inc.” for further discussion).
Goodwill and other intangibles	'
	Goodwill and other intangibles
	Goodwill represents the excess of purchase price and related costs over the values assigned to the net tangible and identifiable intangible assets of businesses acquired. In accordance with ASC 350, Intangibles—Goodwill and Other Intangibles, goodwill is not amortized, but instead is tested for impairment annually, or more frequently if circumstances indicate a possible impairment may exist. Absent any interim indicators of impairment, the Company will test for goodwill impairment on a specified date of each year.
	In accordance with ASC 350, Intangibles—Goodwill and Other Intangibles, the Company amortizes its intangible assets with finite lives over their respective estimated useful lives and will review for impairment whenever impairment indicators exist. The Company’s intangible assets consist of backlog, customer relationships and trade names and trademarks.
Earnings Per Share	'
	The Company computes earnings (loss) per share by applying the guidance stated in ASC 260, Earnings per Share.
Distinguishing Liabilities from Equity	'
	The Company analyzes financial instruments with features of both liabilities and equity under ASC 480, Distinguishing Liabilities from Equity
Derivatives and Hedging	'
	The Company analyzes financial instruments with features of both liabilities and equity under ASC 480, Distinguishing Liabilities from Equity and ASC 815, Derivatives and Hedging.
Compensation - Stock Compensation	'
	ASC 718, Compensation — Stock Compensation, was utilized in order to estimate the fair value of the SAR. The term “fair value” has been defined in Note 8, “Fair value of financial instruments.” ASC 718 requires an entity to measure the cost of employee services received in exchange for an award of equity instruments based on the fair value of the award as of the grant date. That cost is then recognized over the period during which an employee is required to provide service in exchange for the award. ASC 718-10-55-72 provides that, if vesting (or exercisability) of an award is based on satisfying both a market condition and a performance or service condition and it is probable that the performance or service condition will be satisfied, the initial estimate of the service period is the longest of the explicit, implicit or derived service period. The Company has computed compensation expense by applying the guidance stated in ASC 718, on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in-substance, multiple awards (graded vesting attribution method). Since, as noted above, the SAR granted by the Company includes both a market and service condition, the Company used the longest of the periods to define its requisite service period in each separately vesting portion or tranche. To determine the derived service period associated with the SAR’s market condition, the Company performed a Monte Carlo analysis in order to estimate the likely timeframe until the Company’s public equivalent value would exceed its aggregate exercise price over a period of seven days within a period of 10 or fewer trading days (i.e. the value at which the per share value of the Company’s equity exceeds $22.07). Based on the results of this analysis, the derived service period associated with the SAR’s market condition was determined to be 1.78 years. Thus, compensation expense for the first tranche was computed on a straight-line basis over the derived service period of 1.78 years. The second and third tranches were computed on a straight-line basis over the explicit service period.

Acquisition_of_Professional_Po1

Acquisition of Professional Power Products, Inc. (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Summary of Estimates of Fair Value of the Assets Acquired and the Liabilities Assumed as of the Acquisition Date	'
	The purchase price for this acquisition has been provisionally allocated to the assets acquired and liabilities assumed based on their estimated fair values as follows:
		April 1, 2014 (Date
		of Acquisition)
	Assets acquired:
	Cash	$	1,277
	Accounts receivable		3,989
	Inventories		5,073
	Prepaid expenses and other current assets		243
	Property, plant & equipment		2,596
	Total tangible assets	$	13,178
	Intangible assets:
	Intangible assets	$	23,500
	Goodwill		22,372
	Total assets acquired	$	59,050
	Liabilities assumed:
	Accounts payable	$	1,494
	Accrued liabilities		3,257
	Total liabilities assumed	$	4,751
	Net assets acquired	$	54,299
Estimated Useful Lives of Identifiable Intangible Assets	'
	The identifiable intangible assets as a result of the acquisition will be amortized over their respective estimated useful lives as follows:
		Asset			Estimated
		amount			life
	Backlog	$	1,200		18 months
	Customer relationships		20,600		13 years
	Trade names and trademarks		1,700		13 years
	Total identifiable intangible assets	$	23,500
Summary of Supplemental Pro Forma Information	'
	The following supplemental pro forma information presents the financial results as if the transaction had occurred on January 1, 2013 as follows:
		Three months			Six months ended
		ended
		June 30,			June 30,		June 30,
		2013			2014		2013
	Net sales	$	67,567		$	155,293	$	128,699
	Net (loss) income	$	(2,343	)	$	6,199	$	(4,684	)
	(Loss) earnings per share, basic	$	(0.25	)	$	0.59	$	(0.51	)
	(Loss) earnings per share, diluted	$	(0.25	)	$	0.56	$	(0.51	)

Earnings_per_share_Tables

Earnings per share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Computations of Basic and Diluted Earnings (Loss) Per Share	'
	The computations of basic and diluted earnings (loss) per share for the three and six months ended June 30, 2014 and 2013, were as follows:
		Three months ended June 30,						Six months ended June 30,
		2014			2013			2014			2013
	Numerator:
	Net income (loss)	$	4,438		$	(2,100	)	$	6,812		$	(5,027	)
	Change in the value of Private Placement Warrants		(99	)		—			(332	)		—
			4,339			(2,100	)		6,480			(5,027	)
	Denominator:
	Weighted average common shares outstanding-basic		10,627,913			9,243,773			10,585,187			9,171,942
	Incremental shares from assumed exercise of Private Placement Warrants, SAR, restricted stock and contingent consideration		525,242			—			518,688			—
	Weighted average common shares outstanding-diluted		11,153,155			9,243,773			11,103,875			9,171,942
	Earnings (loss) per share of common stock – basic and diluted
	Earnings (loss) per share of common stock – basic	$	0.42		$	(0.23	)	$	0.64		$	(0.55	)
	Earnings (loss) per share of common stock – diluted	$	0.39		$	(0.23	)	$	0.58		$	(0.55	)

Inventories_net_Tables

Inventories, net (Tables)	6 Months Ended
	Jun. 30, 2014
Inventory Disclosure [Abstract]	'
Components of Inventory	'
	Inventory consisted of the following as of:
		June 30, 2014			December 31, 2013
	Raw material	$	74,399		$	53,528
	Work in process		2,566			1,446
	Finished goods		3,387			2,522
	Inventories		80,352			57,496
	Reserve		(1,754	)		(1,510	)
	Inventories, net	$	78,598		$	55,986

Property_plant_and_equipment_n1

Property, plant and equipment, net (Tables)	6 Months Ended
	Jun. 30, 2014
Property Plant And Equipment [Abstract]	'
Components of Property, Plant and Equipment	'
	The components of property, plant and equipment are recorded at cost and included the following as of:
		June 30, 2014			December 31, 2013
	Land	$	260		$	260
	Buildings and improvements		4,965			4,125
	Office furniture and equipment		3,347			2,723
	Tooling and equipment		11,217			7,595
	Transportation equipment		470			203
	Construction in progress		5,582			4,844
	Property, plant and equipment, at cost		25,841			19,750
	Accumulated depreciation		(7,302	)		(6,646	)
	Property, plant and equipment, net	$	18,539		$	13,104

Fair_value_of_financial_instru1

Fair value of financial instruments (Tables)	6 Months Ended
	Jun. 30, 2014
Estimated Fair Value of Private Placement Warrants Publicly Traded Stock Pricing Approach	'
	As of June 30, 2014, and December 31, 2013, the Company estimated the fair value of its Private Placement Warrants with a publicly traded stock pricing approach using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the following:
		June 30, 2014			December 31, 2013
	Market value of the Company’s common stock	$	71.97		$	75.1
	Exercise price	$	13		$	13
	Risk-free interest rate		0.41	%		0.51	%
	Estimated price volatility		42.5	%		42.5	%
	Contractual term		1.83 years			2.33 years
	Dividend yield		—			—
Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument	'
	The following table summarizes the change in the estimated fair value of the Company’s Level 3 Private Placement Warrants liability in the six months ended June 30, 2014:
	Balance at December 31, 2013	$	24,525
	Fair value of private placement warrants exercised		(7,320	)
	Change in the value of private placement warrants		(332	)
	Balance at June 30, 2014	$	16,873
Primary Inputs of Monte Carlo Simulation Model	'
	As of June 30, 2014, the primary inputs of the Monte Carlo simulation model included the following:
		June 30, 2014
	Market value of the Company’s common stock	$	71.97
	Estimated EBITDA volatility		42.5	%
Financial Liability Measured at Fair Value on Recurring Basis	'
	The following table summarizes fair value measurements by level as of June 30, 2014, for the Company’s level 3 financial liabilities measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	16,873
	Contingent consideration		—			—		$	8,000
	The following table summarizes fair value measurement by level as of December 31, 2013, for the Company’s level 3 financial liability measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	24,525
Contingent Consideration [Member]	'
Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument	'
	The following table summarizes the change in the estimated fair value of the Company’s Level 3 contingent consideration liability in the six months ended June 30, 2014:
	Balance at April 1, 2014	$	8,900
	Change in the value of contingent consideration		(900	)
	Balance at June 30, 2014	$	8,000

2012_Incentive_compensation_pl1

2012 Incentive compensation plan (Tables)	6 Months Ended
	Jun. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of Restricted Stock Unit Activity	'
	Restricted stock activity consisted of the following for the six months ended June 30, 2014:
		Shares		Weighted Average Grant Date
				Fair Value
	31-Dec-13		162,993	$	39.29
	Granted		12,000		76.93
	Forfeited		3,000		51.91
	Vested		15,227		37.61
	30-Jun-14		156,766	$	42.1

Recovered_Sheet1

Description of the Company and Business Operations - Additional Information (Detail) (Business Segments [Member])	6 Months Ended
	Jun. 30, 2014
	Segment
Business Segments [Member]	'
Description Of Business And Significant Accounting Policies [Line Items]	'
Number of Operating Segments	1

Acquisition_of_Professional_Po2

Acquisition of Professional Power Products Inc - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended					0 Months Ended	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2014	Apr. 01, 2014	Jun. 30, 2014	Apr. 01, 2014
					Wells Fargo Bank, N.A [Member]	Minimum [Member]	Maximum [Member]	Professional Power Products Inc. ("PPPI") [Member]	Professional Power Products Inc. ("PPPI") [Member]	Professional Power Products Inc. ("PPPI") [Member]
						Wells Fargo Bank, N.A [Member]	Wells Fargo Bank, N.A [Member]
Loans At Acquisition Date [Line Items]	'	'	'	'	'	'	'	'	'	'
Business acquisition net of cash paid	'	'	$44,122,000	'	'	'	'	$45,400,000	'	'
Business acquisition cash acquired	'	'	'	'	'	'	'	1,300,000	'	'
Contingent consideration value	900,000	'	900,000	'	'	'	'	8,900,000	'	'
Contingent consideration initial purchase price	'	'	'	'	'	'	'	54,300,000	'	'
Contingent consideration minimum payable value	'	'	'	'	'	'	'	'	'	5,000,000
Contingent consideration maximum payable value	'	'	'	'	'	'	'	'	'	15,000,000
Common stock issued to seller, price per share	'	'	'	'	'	'	'	'	'	$76.02
Business acquisition agreement date	'	'	1-Apr-14	'	'	'	'	'	'	'
Total transaction cost related to acquisition	811,000	'	811,000	'	'	'	'	'	'	'
Increased line of credit	'	'	'	'	'	75,000,000	90,000,000	'	'	'
Securing term loan	'	'	'	'	5,000,000	'	'	'	'	'
Increased finished goods inventory	'	'	18,455,000	8,580,000	'	'	'	'	'	'
Net Intercompany sales	'	'	'	'	'	'	'	'	7,272,000	'
Operating Income Loss	5,893,000	3,840,000	9,414,000	6,920,000	'	'	'	'	31,000	'
Amortization expense	'	'	'	'	'	'	'	'	$555,000	'

Acquisition_of_Professional_Po3

Acquisition of Professional Power Products Inc - Summary of Estimates of Fair Value of the Assets Acquired and the Liabilities Assumed as of the Acquisition Date (Detail) (USD $)	Jun. 30, 2014	Apr. 01, 2014
In Thousands, unless otherwise specified		Reported Value Measurement [Member]
Assets acquired:	'	'
Cash	'	$1,277
Accounts receivable	'	3,989
Inventories	'	5,073
Prepaid expenses and other current assets	'	243
Property, plant & equipment	'	2,596
Total tangible assets	'	13,178
Intangible assets:	'	'
Intangible assets	'	23,500
Goodwill	22,372	22,372
Total assets acquired	'	59,050
Liabilities assumed:	'	'
Accounts payable	'	1,494
Accrued liabilities	'	3,257
Total liabilities assumed	'	4,751
Net assets acquired	'	$54,299

Acquisition_of_Professional_Po4

Acquisition of Professional Power Products, Inc. - Estimated Useful Lives of Identifiable Intangible Assets (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]	'
Total identifiable intangible assets	$23,500
Backlog [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Total identifiable intangible assets	1,200
Finite lived intangible asset estimated life	'18 months
Customer relationships [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Total identifiable intangible assets	20,600
Finite lived intangible asset estimated life	'13 years
Trade names and trademarks [Member]	'
Finite-Lived Intangible Assets [Line Items]	'
Total identifiable intangible assets	$1,700
Finite lived intangible asset estimated life	'13 years

Acquisition_of_Professional_Po5

Acquisition of Professional Power Products, Inc. - Summary of Supplemental Pro Forma Information (Detail) (USD $)	3 Months Ended	6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Business Combination Increase Decrease To Reflect Liabilities Acquired At Fair Value [Abstract]	'	'	'
Net sales	$67,567	$155,293	$128,699
Net (loss) income	($2,343)	$6,199	($4,684)
(Loss) earnings per share, basic	($0.25)	$0.59	($0.51)
(Loss) earnings per share, diluted	($0.25)	$0.56	($0.51)

Earnings_Per_Share_Schedule_of

Earnings Per Share - Schedule of Computations of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Numerator:	'	'	'	'
Net income (loss)	$4,438	($2,100)	$6,812	($5,027)
Change in the value of Private Placement Warrants	-99	4,207	-332	9,053
Net income (loss) Attributable to Parent	$4,339	($2,100)	$6,480	($5,027)
Common Shares [Member]	'	'	'	'
Denominator:	'	'	'	'
Weighted average common shares outstanding-basic	10,627,913	9,243,773	10,585,187	9,171,942
Incremental shares from assumed exercise of Private Placement Warrants, SAR, restricted stock and contingent consideration	525,242	'	518,688	'
Weighted average common shares outstanding-diluted	11,153,155	9,243,773	11,103,875	9,171,942
Earnings (loss) per share of common stock - basic and diluted	'	'	'	'
Earnings (loss) per share of common stock - basic	$0.42	($0.23)	$0.64	($0.55)
Earnings (loss) per share of common stock - diluted	$0.39	($0.23)	$0.58	($0.55)

Inventories_Net_Components_of_

Inventories, Net - Components of Inventory (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Net [Abstract]	'	'
Raw material	$74,399	$53,528
Work in process	2,566	1,446
Finished goods	3,387	2,522
Inventories	80,352	57,496
Reserve	-1,754	-1,510
Inventories, net	$78,598	$55,986

Recovered_Sheet2

Property, Plant and Equipment, Net - Components of Property, Plant and Equipment (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property Plant And Equipment [Abstract]	'	'
Land	$260	$260
Buildings and improvements	4,965	4,125
Office furniture and equipment	3,347	2,723
Tooling and equipment	11,217	7,595
Transportation equipment	470	203
Construction in progress	5,582	4,844
Property, plant and equipment, at cost	25,841	19,750
Accumulated depreciation	-7,302	-6,646
Property, plant and equipment, net	$18,539	$13,104

Recovered_Sheet3

Fair Value of Financial Instruments - Estimated Fair Value of Private Placement Warrants Publicly Traded Stock Pricing Approach (Detail) (USD $)	0 Months Ended	6 Months Ended	12 Months Ended
	Jun. 06, 2012	Jun. 30, 2014	Dec. 31, 2013
		Private Placement [Member]	Private Placement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Market value of the Company's common stock	'	$71.97	$75.10
Exercise price	'	13	13
Risk-free interest rate	0.92%	0.41%	0.51%
Estimated price volatility	55.00%	42.50%	42.50%
Contractual term	'	'1 year 9 months 29 days	'2 years 3 months 29 days
Dividend yield	'	'	'

Recovered_Sheet4

Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Dec. 31, 2013
					Private Placement Warrants [Member]	Private Placement Warrants [Member]
					Black-Scholes [Member]	Black-Scholes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'	'	'
Warrant sensitivity percentage	'	'	'	'	'	10.00%
Estimated fair value	'	'	'	'	$1,700,000	'
Private placement warrant (income) expense	-99,000	4,207,000	-332,000	9,053,000	'	'
Contingent liability description	'	'	'A five percentage point decrease in the volatility factor would result in an increase in the fair value of the contingent consideration by approximately $50,000.	'	'	'
Change in contingent liability	'	'	50,000	'	'	'
Change in the fair value of contingent consideration	($900,000)	'	'	'	'	'

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument (Detail) (USD $)	3 Months Ended	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Balance beginning	'	$24,525	'
Fair value of private placement warrants exercised	'	-7,320	'
Change in the value of contingent consideration	900	'	'
Change in the value of private placement warrants	'	-332	9,053
Balance ending	16,873	16,873	'
Level 3 [Member] | Contingent Consideration [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Balance beginning	'	8,900	'
Change in the value of contingent consideration	'	-900	'
Balance ending	$8,000	$8,000	'

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Primary Inputs of Monte Carlo Simulation Model (Detail) (Monte Carlo [Member], USD $)	6 Months Ended
	Jun. 30, 2014
Monte Carlo [Member]	'
Fair Value Disclosures [Line Items]	'
Market value of the Company's common stock	$71.97
Estimated EBITDA volatility	42.50%

Fair_Value_of_Financial_Instru4

Fair Value of Financial Instruments - Financial Liability Measured at Fair Value on Recurring Basis (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial liabilities measured at fair value on a recurring basis	$16,873	$24,525
Level 3 [Member] | Private Placement Warrants [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial liabilities measured at fair value on a recurring basis	16,873	24,525
Level 3 [Member] | Contingent Consideration [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Financial liabilities measured at fair value on a recurring basis	$8,000	'

Recovered_Sheet5

Revolving Line of Credit and Term Loan - Additional Information (Detail) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Apr. 01, 2014

Apr. 01, 2014

Jun. 28, 2013

Jun. 30, 2014

Apr. 01, 2014

Jun. 28, 2013

Jun. 30, 2014

Apr. 01, 2014

Jun. 30, 2014

Apr. 01, 2014

Jun. 30, 2014

Apr. 01, 2014

Apr. 01, 2014

Jun. 30, 2014

Mar. 20, 2012

Mar. 20, 2012

Mar. 20, 2012

Term Loan B Debt [Member]

Wells Fargo Bank, N.A [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

BMO Harris Bank N A prime rate [Member]

BMO Harris Bank N A prime rate [Member]

BMO Harris Bank N A prime rate [Member]

BMO Harris Bank N A prime rate [Member]

Wells Fargo Bank, N.A [Member]

Wells Fargo Bank, N.A [Member]

Wells Fargo Bank, N.A [Member]

Wells Fargo Bank, N.A [Member]

Wells Fargo Bank, N.A [Member]

Wells Fargo Bank, N.A [Member]

Term Loan B Debt [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Wells Fargo Bank, N.A [Member]

Wells Fargo Bank, N.A [Member]

Line of Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Agreement provides for borrowings under a revolving line of credit

'

'

'

'

'

$75,000,000

'

'

$100,000,000

'

'

'

'

'

'

'

$50,000,000

'

'

'

Applicable margin, during the period

'

'

'

'

0.00%

0.00%

'

0.50%

0.50%

'

'

'

'

'

'

'

'

'

0.00%

0.50%

Line of credit, interest at LIBOR

'

'

4.66%

'

1.50%

1.50%

'

2.00%

2.00%

'

4.50%

0.16%

'

'

'

'

'

'

1.75%

2.25%

Percentage of revolving unused line fee

'

'

'

0.25%

'

'

'

'

0.25%

'

'

'

'

'

'

'

0.25%

'

'

'

Consecutive days of liquidity threshold

'

'

'

'

'

'

'

'

'

'60 days

'

'

'

'

'

'

'

'

'

'

Liquidity threshold

'

'

'

'

'

'

'

'

9,375,000

'

'

'

'

'

'

'

'

7,500,000

'

'

Percent of total credit facility

'

'

'

'

'

'

'

'

12.50%

'

'

'

'

'

'

'

'

50.00%

'

'

Line of credit facility covenants minimum fixed charge coverage ratio

'

'

'

'

'

1

'

'

'

'

'

'

'

1.2

'

'

'

'

'

'

Increased line of credit

'

'

'

'

'

'

75,000,000

'

'

90,000,000

'

'

'

'

75,000,000

90,000,000

'

'

'

'

Long term borrowings

'

'

'

'

'

'

'

'

'

'

'

'

5,000,000

'

'

'

'

'

'

'

Amortization period

'

'

'

'

'

'

'

'

'

'

'

'36 months

'

'

'

'

'

'

'

'

Line of credit facility covenants maximum debt leverage ratio

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

Line of credit, LIBOR

'

'

'

'

'

'

'

'

'

'

'LIBOR plus 4.5%

'

'

'

'

'

'

'

'

'

Revolving line of credit, scheduled maturity date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20-Mar-17

'

'

'

Outstanding borrowings under its revolving line of credit

69,000,000

9,000,000

4,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit bears interest at BMO Bank's LIBOR rate

1.65%

1.67%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining outstanding balance

1,100,000

8,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of applicable margin interest rate

3.25%

3.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unused and available line of credit balance

$19,400,000

$47,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Income Tax Disclosure [Abstract]	'	'
Company's annual effective tax rate	37.00%	'
Company's quarterly effective tax rate	32.50%	'
Company's income tax rate excluding impact of income/expense associated with private placement warrants	37.00%	35.40%

Recovered_Sheet6

2012 Incentive Compensation Plan - Additional Information (Detail) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

Jun. 06, 2012

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jul. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 06, 2012

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Minimum [Member]

Maximum [Member]

Employee Stock Option 2012 [Member]

Stock Compensation Plan [Member]

Stock Compensation Plan [Member]

Stock Compensation Plan [Member]

SAR [Member]

SAR [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

2012 Plan [Member]

Chief Operating Officer [Member]

Maximum [Member]

2012 Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock repurchased by the company, shares

'

830,925

'

830,925

'

830,925

'

'

'

830,925

'

'

'

'

'

'

'

'

'

'

Common stock available for issuance

'

'

'

'

'

'

'

'

'

'

700,000

'

'

'

'

'

'

'

'

'

Share authorized for stock based compensation

'

'

'

'

'

'

'

'

'

'

'

1,530,925

'

'

'

'

'

'

'

'

Number of shares granted to employees

'

'

'

'

'

'

'

'

'

'

'

'

'

543,872

'

'

174,993

'

'

'

Common stock available for further issuance

'

'

'

'

'

'

'

'

'

'

'

812,060

'

'

'

'

'

'

'

'

Number of shares granted under SAR Award Agreement

543,872

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, market value per share

'

$22.07

'

$22.07

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Valuation dates of common stock under SAR award agreement, description

'

'

'

'Commenced after the SAR Grant Date and prior to the expiration date

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

SAR award expiration period from grant date

'

'

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected term

'

'

'

'6 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Risk-free interest rate

0.92%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividend yield

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Anticipated volatility factor and zero dividend yield

55.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount on valuation of trading activity

'

15.00%

'

15.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of SAR granted

'

'

'

'

'

'

'

'

'

'

'

'

$3.31

'

'

'

$76.93

'

'

'

Service period

'

'

'

'1 year 9 months 11 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected term to exceed public equivalent value over aggregate exercise price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expenses for the SAR granted

'

105,000

450,000

228,000

657,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total unrecognized compensation expense

'

187,000

'

187,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,376,000

Total expected expense

'

'

'

1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected period of recognition of cost

'

'

'

'12 months

'

'

'

'

'

'

'

'

'

'

'

'

'0 years

'

'

'

Compensation expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$435,000

$18,000

$237,000

$18,000

'

'

Restricted stock agreement vesting

'

'

'

'

'

'

'

'

'These shares of Restricted Stock vest in various increments and periods over a maximum of ten years from the date the stock was granted as defined under the applicable Restricted Stock Award Agreement.

'

'

'

'

'

'

'

'

'

'

'

Vesting period for restricted stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

Recovered_Sheet7

2012 Incentive Compensation Plan - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock [Member], USD $)	6 Months Ended
	Jun. 30, 2014
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Beginning balance, shares	162,993
Granted, shares	12,000
Forfeited, shares	3,000
Vested, shares	15,227
Ending balance, shares	156,766
Weighted average grant date fair value, beginning balance	$39.29
Granted, weighted average grant date fair value	$76.93
Forfeited, weighted average grant date fair value	$51.91
Vested, weighted average grant date fair value	$37.61
Weighted average grant date fair value, ending balance	$42.10

Stockholders_Equity_Additional

Stockholders Equity - Additional Information (Detail) (USD $)

Jun. 30, 2014

Dec. 31, 2013

Aug. 15, 2013

Jun. 30, 2014

Jun. 30, 2014

Jul. 16, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Feb. 14, 2014

SAR [Member]

SAR [Member]

Restricted Stock [Member]

Underwritten Public Offering [Member]

Private Placement Warrants [Member]

Private Placement Warrants [Member]

Private Placement Warrants [Member]

Private Placement Warrants [Member]

Private Placement Warrants [Member]

Private Placement [Member]

Private Placement [Member]

Shelf Registration [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Series A convertible preferred stock, shares authorized

114,000

114,000

'

'

'

'

'

'

'

'

'

'

'

'

Series A convertible preferred stock, par value

$0.00

$0.00

'

'

'

'

'

'

'

'

'

'

'

'

Series A convertible preferred stock, shares issued

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Series A convertible preferred stock, shares outstanding

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Common stock exercise price

$0.00

$0.00

'

'

'

'

$13

'

$13

'

'

'

'

'

Common stock, shares authorized

50,000,000

50,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares issued

11,559,147

11,352,812

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares outstanding

10,728,222

10,521,887

'

'

'

'

'

'

'

'

'

'

'

'

Public offering shares

'

'

'

'

'

2,005,000

'

'

'

'

'

'

'

'

Underwritten public offering Price per share

'

'

'

'

'

$35

'

'

'

'

'

$71.97

$75.10

'

Shares sold through Public offering

'

'

'

'

'

1,050,000

'

'

'

'

'

'

'

'

Share sold by stockholders through public offering

'

'

'

'

'

955,000

'

'

'

'

'

'

'

'

Proceeds to the company from Public offering

'

'

'

'

'

$34,530,000

'

'

'

'

'

'

'

'

Public offering expense

'

'

'

'

'

514,000

'

'

'

'

'

'

'

'

Grantee exercised Stock appreciation right

'

'

181,291

120,000

'

'

'

'

'

'

'

'

'

'

Common stock new issued to meet Stock appreciation right exercise

'

'

96,504

85,903

10,847

'

'

'

'

'

'

'

'

'

Income tax benefit realized in connection with exercise of stock appreciation right

'

'

'

2,248,000

214,000

'

'

'

'

'

'

'

'

'

Shares vested and unexercised

'

'

'

61,291

'

'

'

'

'

'

'

'

'

'

Shares issued withheld to satisfy income tax obligation, Value

'

'

'

'

340,000

'

'

'

'

'

'

'

'

'

Shares of common stock issuable upon exercise of the private placement warrant

'

'

'

'

'

'

'

'

750,002

'

'

'

'

'

Warrants expiry date

'

'

'

'

'

'

'

'

'

'

'

29-Apr-16

'

'

Shares issued for warrants exercised

'

'

'

'

'

'

69,333

70,833

109,585

209,167

'

'

'

'

Common stock reserved for the exercise of the Private Placement Warrants

'

'

'

'

'

'

287,257

'

287,257

'

396,842

'

'

'

Aggregate offering value

'

'

'

'

'

'

'

'

'

'

'

'

'

$150,000,000

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Commitment And Contingencies [Line Items]	'	'
Commitment towards investments in joint venture	$1,200,000	'
Contribution to joint venture	$850,000	$500,000
Private Placement [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Registration Rights Agreement filing description	'The Private Placement Registration Rights Agreement provides, among other things, that if, after such registration statement has been declared effective by the SEC, sales cannot be made pursuant to such registration statement for any reason, but excluding any period for which the use of any prospectus included in a registration statement has been suspended if and so long as certain conditions exist (which period may not be for more than 20 consecutive days or for a total of more than 45 days in any 12-month period), then the Company is required to pay amounts representing liquidated damages to each of the investors, on the same basis as the liquidated damages the Company could have been required to pay in connection with the initial registration statement filed pursuant to the Private Placement Registration Rights Agreement.	'
Number of consecutive days for suspension of registration statement	'20 days	'
Aggregated number of days, in which conditions regarding suspension persist	'45 days	'
Number of months as base period for aggregate and consecutive period	'12 months	'
Percentage of aggregate amount payable to investors	1.50%	'
Eligible period to use a registration statement	'30 days	'

Related_Party_Transaction_Addi

Related Party Transaction - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Apr. 01, 2014	Jun. 30, 2014
Related Party Transactions [Abstract]	'	'
Initial term of lease agreement	'7 years	'
Lease agreement expiration date	31-Mar-21	'
Initial annual base rent	$480,000	'
Lease expense	'	$120,000