Employee Benefit Plans - Funded Status of Defined Benefit Pension Plans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Noncurrent pension asset		$ 364
Defined Benefit Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of the year	54,658	59,415
Interest cost	2,538	2,161	2,379
Participant contributions	9	7
Actuarial losses (gains)	8,585	(3,696)
Change in currency exchange rates	(669)	223
Benefits paid	(3,896)	(3,452)
Benefit obligations at end of the year	61,225	54,658	59,415
Fair value at beginning of the year	49,402	45,498
Actual return on plan assets	2,404	5,589
Employer contributions	1,553	1,510
Change in currency exchange rates	(656)	250
Fair value of plan assets at end of year	48,816	49,402	45,498
Funded status	(12,409)	(5,256)
Noncurrent pension asset		364
Current	(167)	(167)
Noncurrent	(12,242)	(5,453)
Amounts recognized in the Consolidated Balance Sheets	(12,409)	(5,256)
Accumulated other comprehensive loss - actuarial losses, net	33,135	24,557
Total	20,726	19,301
Accumulated benefit obligations (ABO)	61,225	54,658
OPEB
Defined Benefit Plan Disclosure [Line Items]
Balance at beginning of the year	3,864	4,505
Interest cost	114	105	157
Actuarial losses (gains)	385	(240)
Benefits paid	(481)	(506)
Benefit obligations at end of the year	3,882	3,864	4,505
Funded status	(3,882)	(3,864)
Current	(541)	(596)
Noncurrent	(3,341)	(3,268)
Amounts recognized in the Consolidated Balance Sheets	(3,882)	(3,864)
Accumulated other comprehensive loss - actuarial losses, net	1,025	464
Prior service credit	(1,162)	(1,806)
Accumulated other comprehensive income (loss)	$ (137)	$ (1,342)