Retirement Plans and Benefits - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Multiemployer Plans [Line Items] | |||
| Percentage limit of total plan contributions | 5.00% | ||
| Contributions to defined contribution plans | $ 9.9 | $ 28.3 | $ 10.0 |
| Minimum | |||
| Multiemployer Plans [Line Items] | |||
| Percentage limit of total plan contributions | 70.00% | ||
| Limit of individual contributions of plan | $ 0.1 | ||
| Maximum | |||
| Multiemployer Plans [Line Items] | |||
| Percentage limit of total plan contributions | 80.00% | ||