Long-term Debt - Additional Information (Detail) (USD $)	12 Months Ended					12 Months Ended					12 Months Ended			12 Months Ended						12 Months Ended				12 Months Ended					12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Borrowing [Member]	Dec. 31, 2012 Standby Letters of Credit [Member]	Dec. 31, 2012 Stanadyne Corporation [Member]	Dec. 31, 2011 Stanadyne Corporation [Member]	Dec. 31, 2010 Stanadyne Corporation [Member]	Dec. 31, 2012 U.S. Revolver [Member]	Dec. 31, 2011 U.S. Revolver [Member]	Dec. 31, 2012 U.S. Revolver [Member] Stanadyne Corporation [Member]	Dec. 31, 2011 U.S. Revolver [Member] Stanadyne Corporation [Member]	Dec. 31, 2012 U.S. Revolver [Member] Stanadyne Corporation [Member] LIBOR margin [Member]	Dec. 31, 2012 U.S. Revolver [Member] SpA, SAPL, and SCC [Member]	Dec. 31, 2010 SAPL Debentures [Member]	Dec. 31, 2012 SAPL Debentures [Member]	Dec. 31, 2011 SAPL Debentures [Member]	Dec. 31, 2012 SAPL Debentures [Member] Stanadyne Corporation [Member]	Dec. 31, 2011 SAPL Debentures [Member] Stanadyne Corporation [Member]	Dec. 31, 2012 Senior Subordinated Notes [Member]	Dec. 31, 2011 Senior Subordinated Notes [Member]	Dec. 31, 2012 Senior Subordinated Notes [Member] Stanadyne Corporation [Member]	Dec. 31, 2011 Senior Subordinated Notes [Member] Stanadyne Corporation [Member]	Dec. 31, 2012 Holdings Senior Discount Notes [Member]	Dec. 31, 2011 Holdings Senior Discount Notes [Member]	Dec. 20, 2004 Holdings Senior Discount Notes [Member]	Dec. 31, 2012 Holdings Senior Discount Notes [Member] Stanadyne Corporation [Member]	Dec. 31, 2011 Holdings Senior Discount Notes [Member] Stanadyne Corporation [Member]	Dec. 31, 2012 SAPL debt, payable to India banks through 2013 [Member]	Dec. 31, 2011 SAPL debt, payable to India banks through 2013 [Member]	Dec. 31, 2012 SAPL debt, payable to India banks through 2013 [Member] Stanadyne Corporation [Member]	Dec. 31, 2011 SAPL debt, payable to India banks through 2013 [Member] Stanadyne Corporation [Member]	Dec. 31, 2012 SpA debt, payable to Italian banks through 2013 [Member]	Dec. 31, 2011 SpA debt, payable to Italian banks through 2013 [Member]	Dec. 31, 2012 SpA debt, payable to Italian banks through 2013 [Member] Stanadyne Corporation [Member]	Dec. 31, 2011 SpA debt, payable to Italian banks through 2013 [Member] Stanadyne Corporation [Member]	Dec. 31, 2012 Fifth Credit Amendment [Member] Stanadyne and Wells Fargo Capital Finance, LLC [Member] February 2013 [Member]	Dec. 31, 2012 SAPL debenture embedded conversion option [Member]	Dec. 31, 2011 SAPL debenture embedded conversion option [Member]	Dec. 31, 2012 Term Loan Agreement [Member] Stanadyne Corporation and Jefferies Finance LLC [Member]	Dec. 31, 2012 Term Loan Agreement [Member] Stanadyne Corporation and Jefferies Finance LLC [Member] February 2013 [Member]
Debt Instrument [Line Items]
Approximated Fair value and carrying value of notes																				$ 148,800,000	$ 135,400,000			$ 68,000,000	$ 93,000,000
Maximum borrowing capacity									55,800,000		55,800,000
Pledge percentage of stock														65.00%
Line of Credit Facility Decrease Increment Amount Required	1,000,000
Line of Credit Facility Decrease Notice Period	10 days
Applicable margin percentage minimum													1.25%
Applicable margin percentage maximum													1.75%
Revolving credit threshold where covenant test is required											4,000,000
Fixed charge coverage ratio covenant											1.1
Debt instrument due date											Apr. 30, 2014									Aug. 15, 2014																				Jun. 30, 2014
Revolving credit period for proving annual financial information									105 days
Aggregate additional amount of term loan																																					5,000,000				15,000,000
Total commitment	297,684,000	283,884,000				197,684,000	183,884,000		21,090,000	8,000,000	21,090,000	8,000,000				1,251,000	1,202,000	1,251,000	1,202,000	160,000,000	160,000,000	160,000,000	160,000,000	100,000,000	100,000,000				4,660,000	3,221,000	4,660,000	3,221,000	2,093,000	2,504,000	2,093,000	2,504,000	60,800,000
Increased interest rate																																					0.25
Revolving credit, remaining borrowing capacity				21,100,000	3,500,000				23,000,000
Commitment fee	0.50%
Cash proceeds from issuance of debentures			1,627,000					1,627,000							1,600,000
Interest on debentures															11.00%									12.00%																10.00%
Financial liabilities																																						1,150,000	427,000
Unrealized loss on derivatives																																						(728,000)	(121,000)
Notes outstanding																						160,000,000	160,000,000
Fixed interest rate																						10.00%	10.00%
Aggregate original principal amount of term loan																																									25,000,000
Senior discount notes issued																										100,000,000
Long-term debt, maturity year																								2015					2013				2013
Senior discount notes were issued at discounted price																								58.145%
Net proceeds from senior discount notes issued	265,268,000	265,617,000				165,268,000	165,617,000																	58,145,000
Weighted average interest rate on current and long-term borrowings at SAPL																													12.30%	12.60%
Weighted average interest rate on short-term borrowings at SpA																																	5.00%	4.40%
Interest paid on long-term debt	$ 30,044,000	$ 29,881,000	$ 29,324,000			$ 18,044,000	$ 17,881,000	$ 17,324,000

STANADYNE CORP 10-K