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Financial Instruments - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
6 3/4 % Senior Notes Due 2020
Dec. 31, 2013
6 3/4 % Senior Notes Due 2020
Jun. 30, 2014
6.0% Senior Notes Due 2022
Dec. 31, 2013
6.0% Senior Notes Due 2022
Assets Sold under Agreements to Repurchase [Line Items]                  
Long-term debt, fair value $ 753,800,000   $ 753,800,000   $ 752,800,000        
Long-term debt, carrying value 717,000,000   717,000,000   717,014,000        
Interest percentage           6.75% 6.75% 6.00% 6.00%
Debt maturity period           2020 2020 2022 2022
Gain/Loss on remeasurement of contingent consideration 261,000 8,216,000 2,383,000 8,216,000          
Accretion expense $ 300,000 $ 800,000 $ 500,000 $ 1,500,000