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Employee Retirement Plans - Summary of Changes in Fair Value of Level 3 Pension Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance $ 160,812 $ 181,877
Actual return on plan assets 14,873 4,619
Contributions 8 32
Benefits paid (2,167) (7,499)
Foreign currency gain (loss) 1,718 (17,622)
Ending balance 181,877 172,511
Level 3    
Defined Benefit Plan, Change in Fair Value of Plan Assets, Level 3 Reconciliation [Roll Forward]    
Beginning balance 2,908 3,104
Actual return on plan assets 165 3
Contributions 59 84
Benefits paid (28) (109)
Foreign currency gain (loss)   (145)
Ending balance $ 3,104 $ 2,937