Annual report pursuant to Section 13 and 15(d)

Reconciliation of Beginning and Ending Balance for Assets and Liabilities (Detail)

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Reconciliation of Beginning and Ending Balance for Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Beginning balances-Liabilities $ 16,576 $ 15,970
Total gain (loss) included in accumulated other comprehensive loss, Liabilities (1,576) 1,736
Total gain included in earnings, Liabilities (808) (1,130)
Ending balance - Liabilities 14,192 16,576
Beginning balances, Assets   8,955
Total gain (loss) included in accumulated other comprehensive loss   (8,955)
Total gain included in earnings