Basis of Presentation and Significant Accounting Policies - Summary of Changes in Carrying Amount of Accrued Warranty Expense (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Standard Product Warranty Disclosure [Abstract]
Balance at beginning of period	$ 56,436	$ 83,682
Additions	5,463	11,423
Acquisition of MEGTEC	4,693
Expirations and other changes	(3,204)	(8,038)
Payments	(4,568)	(11,659)
Translation and other	5	(921)
Balance at end of period	$ 58,825	$ 74,487