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Financial Instruments - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Assets Sold under Agreements to Repurchase [Line Items]          
Long-term debt, fair value $ 740,500   $ 740,500   $ 735,000
Long-term debt, carrying value 711,000   711,000   $ 711,000
Gain/Loss on remeasurement of contingent consideration 1,700 $ 300 1,700 $ 2,400  
Contractual Settlement $ 1,500   $ 1,500    
6 3/4 % Senior Notes Due 2020          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest percentage 6.75%   6.75%   6.75%
Debt maturity period     2020   2020
6.0% Senior Notes Due 2022          
Assets Sold under Agreements to Repurchase [Line Items]          
Interest percentage 6.00%   6.00%   6.00%
Debt maturity period     2022   2022