Quarterly report pursuant to Section 13 or 15(d)

Reconciliation of Beginning and Ending Balance for Liabilities Measured at Fair Value on Recurring Basis Unobservable Inputs (Detail)

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Reconciliation of Beginning and Ending Balance for Liabilities Measured at Fair Value on Recurring Basis Unobservable Inputs (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balances - Liabilities $ 7,259 $ 10,435 $ 9,176 $ 14,192
Total loss included in accumulated other comprehensive loss 112 1,282 1,180 405
Settlements (1,533) (1,467) (4,518) (4,347)
Ending balances - Liabilities $ 5,838 $ 10,250 $ 5,838 $ 10,250