Description of Business and Summary of Significant Accounting Policies - Additional Information (Detail)			1 Months Ended		3 Months Ended	12 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 12, 2016 USD ($)	Jan. 31, 2017 USD ($) shares	Mar. 31, 2011 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($) product country reporting_unit shares	Dec. 31, 2015 USD ($) shares	Dec. 31, 2014 USD ($) shares
Organization And Nature Of Business [Line Items]
Number of product lines (more than) | product						42
Number of countries in which the company has production facilities | country						12
Loss on extinguishment of debt						$ 1,989,000
Carrying amount of financial instruments	$ 325,969,000				$ 325,969,000	$ 325,969,000	$ 231,568,000
Weighted average shares, basic | shares						25,719,000	26,064,000	26,713,000
Debt	372,394,000				372,394,000	$ 372,394,000	$ 243,817,000
Impairment of intangible assets					6,600,000	6,568,000
Impairment of goodwill						0	0
Impairment of indefinite-lived intangible assets					0	$ 6,600,000
Minimum number of entity's reporting units where the estimated fair value could be affected by changes to discount rate and the forecasted profitability | reporting_unit						1
Advertising costs						$ 2,800,000	3,100,000	$ 2,900,000
Tax benefit sustainable						greater than 50%
Minimum [Member]
Organization And Nature Of Business [Line Items]
Amortization period						8 years
Royalty rate indication based on return as a percentage of revenue						1.00%
Maximum [Member]
Organization And Nature Of Business [Line Items]
Amortization period						17 years
Royalty rate indication based on return as a percentage of revenue						1.25%
Electromagnetic Clutches and Brakes [Member] | Building [Member]
Organization And Nature Of Business [Line Items]
Impairment of assets							1,100,000
Couplings, Clutches and Brakes [Member]
Organization And Nature Of Business [Line Items]
Impairment of intangible assets					6,600,000
Couplings, Clutches and Brakes [Member] | Building [Member]
Organization And Nature Of Business [Line Items]
Impairment of assets						$ 900,000	900,000
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
Organization And Nature Of Business [Line Items]
Cash and cash equivalents	100,000				100,000	100,000	300,000
2015 Revolving Credit Facility [Member]
Organization And Nature Of Business [Line Items]
Debt	313,620,000				313,620,000	313,620,000	$ 145,152,000
Line of Credit [Member] | 2015 Revolving Credit Facility [Member]
Organization And Nature Of Business [Line Items]
Debt	$ 313,600,000				$ 313,600,000	$ 313,600,000
Convertible Notes [Member]
Organization And Nature Of Business [Line Items]
Interest rate on notes (as a percent)	2.75%	2.75%			2.75%	2.75%	2.75%
Debt instrument maturity year		2031
Notes redemption date						Jan. 12, 2017
Surrender of notes for conversion end date						Jan. 09, 2017
Conversion of notes into shares (in shares)		0.390809
Principal amount of notes		$ 1,000		$ 1,000
Conversion of notes into shares, amount	$ 39,300,000					$ 39,300,000
Conversion of notes into shares (in shares) | shares	1,500,000			36.0985		1,536,992
Loss on extinguishment of debt	$ 1,900,000
Carrying amount of financial instruments	42,921,000				$ 42,921,000	$ 42,921,000	$ 75,938,000
Carrying amount of of Convertible Notes	42,900,000				42,900,000	42,900,000	85,000,000
Estimated fair value of financial instruments	$ 65,500,000				$ 65,500,000	$ 65,500,000	$ 91,700,000
Convertible Notes [Member] | Subsequent Event [Member]
Organization And Nature Of Business [Line Items]
Conversion of notes into shares (in shares) | shares			1,700,000
Redemption of debt			$ 900,000
Weighted average shares, basic | shares			3,200,000