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Summary of Pension Assets in Three Tier Fair Value Hierarchy for Benefit Plan (Detail) - USD ($)		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Receivables		$ 400,000	$ 100,000
U.S. Benefit Plans
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		131,100,000	128,100,000	$ 134,000,000
U.S. Benefit Plans | Total
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value	[1]	130,700,000	128,200,000
U.S. Benefit Plans | Total | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		5,700,000	6,800,000
U.S. Benefit Plans | Total | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		36,500,000	37,800,000
U.S. Benefit Plans | Total | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		16,900,000	18,000,000
U.S. Benefit Plans | Total | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		16,300,000	19,700,000
U.S. Benefit Plans | Total | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		12,400,000	6,900,000
U.S. Benefit Plans | Total | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		7,100,000	3,000,000
U.S. Benefit Plans | Total | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		9,900,000	7,700,000
U.S. Benefit Plans | Total | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		14,900,000	13,100,000
U.S. Benefit Plans | Total | Fixed Income Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	700,000
U.S. Benefit Plans | Total | Mutual Fund [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		5,600,000	10,500,000
U.S. Benefit Plans | Total | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		5,400,000	4,000,000
U.S. Benefit Plans | Level 1
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		97,600,000	100,100,000
U.S. Benefit Plans | Level 1 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		5,700,000	6,800,000
U.S. Benefit Plans | Level 1 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		36,400,000	37,700,000
U.S. Benefit Plans | Level 1 | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		16,900,000	18,000,000
U.S. Benefit Plans | Level 1 | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		8,600,000	12,800,000
U.S. Benefit Plans | Level 1 | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		11,900,000	6,900,000
U.S. Benefit Plans | Level 1 | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		7,100,000	2,700,000
U.S. Benefit Plans | Level 1 | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 1 | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 1 | Fixed Income Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	700,000
U.S. Benefit Plans | Level 1 | Mutual Fund [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		5,600,000	10,500,000
U.S. Benefit Plans | Level 1 | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		5,400,000	4,000,000
U.S. Benefit Plans | Level 2
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		33,100,000	28,100,000
U.S. Benefit Plans | Level 2 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		100,000	100,000
U.S. Benefit Plans | Level 2 | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		7,700,000	6,900,000
U.S. Benefit Plans | Level 2 | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		500,000	0
U.S. Benefit Plans | Level 2 | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	300,000
U.S. Benefit Plans | Level 2 | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		9,900,000	7,700,000
U.S. Benefit Plans | Level 2 | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		14,900,000	13,100,000
U.S. Benefit Plans | Level 2 | Fixed Income Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | Mutual Fund [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 2 | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | US Small / Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Developed International
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Equity Securities Emerging Markets
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | US Government Debt Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Asset-backed Securities | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Corporate Bond Securities [Member] | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Fixed Income Funds [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Mutual Fund [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plans | Level 3 | Real Estate [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		48,500,000	54,300,000	$ 59,000,000
Non-U.S. Benefit Plan | Total
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		48,500,000	54,300,000
Non-U.S. Benefit Plan | Total | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		400,000	9,200,000
Non-U.S. Benefit Plan | Total | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		41,900,000	40,100,000
Non-U.S. Benefit Plan | Total | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		1,300,000	2,700,000
Non-U.S. Benefit Plan | Total | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		4,900,000	2,300,000
Non-U.S. Benefit Plan | Level 1
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		4,300,000	18,700,000
Non-U.S. Benefit Plan | Level 1 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		400,000	9,200,000
Non-U.S. Benefit Plan | Level 1 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	5,300,000
Non-U.S. Benefit Plan | Level 1 | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		1,300,000	2,700,000
Non-U.S. Benefit Plan | Level 1 | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,600,000	1,500,000
Non-U.S. Benefit Plan | Level 2
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		44,200,000	35,600,000
Non-U.S. Benefit Plan | Level 2 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 2 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		41,900,000	34,800,000
Non-U.S. Benefit Plan | Level 2 | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 2 | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,300,000	800,000
Non-U.S. Benefit Plan | Level 3
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | US Government Agencies Debt Securities [Member]
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Company bonds and debt securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		$ 0	$ 0
[1] Total assets at fair value in the table above exclude a net receivable of $0.4 million and a net payable of $0.1 million at December 31, 2016 and 2015, respectively.

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Fair Value Hierarchy Of Plan Assets By Category [Line Items]

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

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