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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Jun. 30, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2013 | Dec. 31, 2012
Income Tax [Line Items] |  |  |  |  |  |  |  |
Accumulated undistributed earnings of certain foreign subsidiaries | $ 28.0 | $ 25.2 |  | $ 28.0 | $ 25.2 |  |  |
Deferred tax asset, federal net operating loss carryforwards | 4.0 | 5.1 |  | 4.0 | 5.1 |  |  |
Deferred tax asset, state net operating loss carryforwards | 6.8 | 5.7 |  | 6.8 | 5.7 |  |  |
Deferred tax asset, foreign net operating loss carryforwards | 5.2 | 3.0 |  | 5.2 | 3.0 |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Motor Vehicle Credits |  | 0.2 |  |  | 0.2 |  |  |
Deferred tax asset, U.S. research tax credit carryforwards | 1.5 | 5.0 |  | 1.5 | 5.0 |  |  |
Deferred tax asset, U.S. foreign tax credits carryforwards | 8.3 | 22.3 |  | 8.3 | 22.3 |  |  |
Deferred tax asset, U.S. alternative minimum tax credits carryforwards | 3.3 | 3.3 |  | 3.3 | 3.3 |  |  |
Deferred tax asset, valuation allowance | 5.9 | 3.8 |  | 5.9 | 3.8 |  | $ 10.4 |
Total deferred tax assets | 96.6 | 117.4 |  | 96.6 | 117.4 |  |  |
Income taxes paid |  |  |  | 9.6 | 7.2 | $ 1.3 |  |
Unrecognized tax benefits | 2.2 | 2.0 |  | 2.2 | 2.0 | 3.9 |  | $ 4.0
Unrecognized tax benefits that, interests | 0.8 | 0.8 |  | 0.8 | 0.8 |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | 2.5 | 2.5 |  | 2.5 | 2.5 |  |  |
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount |  |  |  |  | (3.4) |  |  |
Decrease in valuation allowance | 3.5 | 6.7 | $ 102.4 |  |  |  |  |
Income tax expense (benefit) | (1.4) | (3.5) |  | $ 34.1 | $ 23.7 | $ (108.6) |  |
Effective Income Tax Rate Reconciliation, Percent |  |  |  | 34.10% | 28.40% | (247.40%) |  |
Benefit associated with tax planning strategy | 4.2 |  |  | $ 4.2 |  |  |  |
Adjustment of deferred tax assets | $ 2.4 |  |  | 2.4 |  |  |  |
Unrecognized tax benefits, period increase (decrease) |  |  |  | (1.0) |  |  |  |
Change in enacted tax rate |  |  |  | $ 0.4 |  |  |  |
Research Tax Credit Carryforward |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Deferred tax asset, tax credit carryforwards expiration year |  |  |  | 2019 |  |  |  |
Internal Revenue Service (IRS) |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Deferred tax asset, net operating loss carryforwards expiration year |  |  |  | 2027 |  |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Deferred tax asset, net operating loss carryforwards expiration year |  |  |  | 2016 |  |  |  |
Foreign Tax Authority |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Deferred tax asset, tax credit carryforwards expiration year |  |  |  | 2021 |  |  |  |
Current Deferred Tax Assets [Member] |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Unrecognized tax benefits, period increase (decrease) |  |  |  | $ (0.5) | $ (0.3) |  |  |
Impact of Adoption |  |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |  |
Deferred tax assets |  | $ (18.8) |  |  | $ (18.8) |  |  |

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