Pension and Other Postretirement Benefits - Change in Plan Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Change in plan assets:
Fair value of plan assets, end of year	$ 198,367	$ 173,154
Pension Obligations [Member]
Change in plan assets:
Fair value of plan assets, beginning of year	173,154	160,806
Actual return on plan assets	29,416	16,449
Employer contributions	10,035	10,448
Plan participant contributions	105	146
Foreign currency exchange rate changes	(186)	1,837
Benefits paid	(14,157)	(16,532)
Fair value of plan assets, end of year	198,367	173,154
Funded status, end of year	(60,056)	(90,722)
Other Postretirement Obligations [Member]
Change in plan assets:
Employer contributions	2,416	2,579
Plan participant contributions	11	11
Benefits paid	(2,427)	(2,590)
Funded status, end of year	$ (46,614)	$ (51,772)