Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation And Qualifying Accounts Disclosure [Line Items]
Charged/ (credited) to expense	$ 35,418	$ 34,110
Warranty and overhaul reserves
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	87,849	60,593	$ 58,212
Charged/ (credited) to expense			23,059
Charged/(credited) to other accounts	(1,762)	12,717	(75)
Deductions from reserves	29,441	19,571	20,603
Balance at end of period	92,064	87,849	60,593
Allowance for doubtful accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	6,270	5,707	6,656
Charged/ (credited) to expense	2,026	4,200	2,361
Charged/(credited) to other accounts			0
Deductions from reserves	2,682	3,637	3,310
Balance at end of period	5,614	6,270	5,707
Valuation allowance-taxes
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	1,818	3,332	2,141
Charged/ (credited) to expense	7,024	(1,514)	1,191
Charged/(credited) to other accounts	3,781
Balance at end of period	12,623	1,818	3,332
Merger and restructuring reserve
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	686	775	836
Charged/ (credited) to expense	0	0	0
Deductions from reserves	64	89	61
Balance at end of period	$ 622	$ 686	$ 775