Detail of Certain Balance Sheet Accounts - Additional Information (Detail) - USD ($) $ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Balance Sheet Related Disclosures [Abstract] | ||
| Deferred compensation plan assets | $ 33.4 | $ 33.6 |
| Deferred tax assets | 75.2 | 77.5 |
| Deferred compensation plan liabilities | 57.8 | 58.1 |
| Deferred income tax liabilities | $ 7.6 | $ 7.8 |
| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer). No definition available.
|
| X | ||||||||||
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences, with jurisdictional netting and classified as noncurrent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|