Contracts-In-Process And Long-Term Receivables (Credit Quality Of Financing Receivables) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	$ 465,194	$ 417,496
Rating Categories, A/BBB [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	75,592	41,607
Rating Categories, BB/B [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	276,904	246,373
Rating Categories, B/CCC [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	106,376	94,156
Rating Categories, Customers In Bankruptcy [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables		39,307
Rating Categories, Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Financing receivables	$ 6,322	$ (3,947)