Employee Benefit Plans - Information Concerning Defined Benefit Pension Plans (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|---|---|---|---|
| Defined Benefit Plan Disclosure [Line Items] | |||
| PBO for plans for which ABO exceeds plan assets | $ 47,895 | $ 61,225 | |
| ABO for plans for which ABO exceeds plan assets | 47,895 | 61,225 | |
| Fair value of plan assets for plans for which ABO exceeds plan assets | 33,573 | 48,816 | |
| U.S. Plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| PBO | 47,895 | 50,351 | |
| Fair value of plan assets | 33,573 | 38,131 | |
| U.K. plan | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| PBO | 9,191 | 10,874 | |
| Fair value of plan assets | 10,494 | 10,685 | |
| Defined Benefit Pension Plans | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| PBO | 57,086 | 61,225 | $ 54,658 |
| Fair value of plan assets | $ 44,067 | $ 48,816 | $ 49,402 |