Financial Instruments - Valuation of Financial Instruments Recorded on Fair Value Basis (Detail) - USD ($) $ in Millions |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Noncurrent marketable securities | $ 6.0 | $ 2.4 |
| Fair Value Measurements Recurring | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Currency forward contracts | (1.2) | |
| Interest rate swap contract | (3.1) | (3.5) |
| Noncurrent marketable securities | 6.0 | 2.4 |
| Fair Value Measurements Recurring | Level 1 | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Currency forward contracts | (1.2) | |
| Noncurrent marketable securities | 6.0 | 2.4 |
| Fair Value Measurements Recurring | Level 2 | ||
| Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] | ||
| Interest rate swap contract | $ (3.1) | $ (3.5) |