Employee Benefit Plans - Composition of Pension Plan Assets by Fair Value Level (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|---|---|---|---|
| U.S. Plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | $ 33,573 | $ 38,131 | |
| U.K. plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | 10,494 | 10,685 | |
| Defined Benefit Pension Plans | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | 44,067 | 48,816 | $ 49,402 |
| CMRT | U.S. Plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | 33,573 | 38,131 | |
| Other | U.K. plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | 10,494 | 10,685 | |
| Level 1 | Defined Benefit Pension Plans | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | 10,494 | 10,685 | |
| Level 1 | Other | U.K. plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | 10,494 | 10,685 | |
| Level 2 | Defined Benefit Pension Plans | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | 33,573 | 38,131 | |
| Level 2 | CMRT | U.S. Plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Total | $ 33,573 | $ 38,131 |