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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Amortization expense of finite life intangible assets $ 2,600,000 $ 1,800,000 $ 5,230,000 $ 3,593,000    
Amortization expense of finite life intangibles for 2015 5,300,000   5,300,000      
Amortization expense of finite life intangibles for 2016 9,200,000   9,200,000      
Amortization expense of finite life intangibles for 2017 7,900,000   7,900,000      
Amortization expense of finite life intangibles for 2018 6,300,000   6,300,000      
Amortization expense of finite life intangibles for 2019 5,200,000   5,200,000      
Goodwill 169,324,000   169,324,000   $ 167,547,000 $ 134,062,000
Indefinite-lived intangible assets 19,528,000   19,528,000   19,766,000 18,419,000
Definite-lived intangible assets 52,420,000 $ 42,933,000 52,420,000 $ 42,933,000 58,398,000 $ 46,611,000
Reporting Unit One [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Goodwill 77,900,000   $ 77,900,000      
Goodwill impairment charges         0  
Decrease in projected revenue growth rate     0.30%      
Decrease in projected operational profit     0.70%      
Indefinite-lived intangible assets 6,800,000   $ 6,800,000      
Reporting Unit One [Member] | Indefinite-lived Intangible Assets [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Decrease in projected revenue growth rate     0.70%      
Reporting Unit Two [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Goodwill 13,000,000   $ 13,000,000   $ 90,900,000  
Estimated fair value of goodwill exceeds from its carrying value         3.00%  
Decrease in projected revenue growth rate     1.00%      
Decrease in projected operational profit     0.90%      
Indefinite-lived intangible assets 2,300,000   $ 2,300,000      
Indefinite life intangible assets, impairment charges         $ 0  
Definite-lived intangible assets         $ 24,000,000  
Reporting Unit Two [Member] | Indefinite-lived Intangible Assets [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Decrease in projected revenue growth rate     0.40%      
Three Reporting Units [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Estimated fair value of goodwill exceeds from its carrying value         5.00%  
Indefinite-lived intangible assets $ 900,000   $ 900,000   $ 10,000,000  
Three Reporting Units [Member] | Indefinite-lived Intangible Assets [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Decrease in projected revenue growth rate     1.60%      
Four Reporting Units [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Goodwill         105,400,000  
Five Reporting Units [Member]            
Schedule Of Goodwill And Other Intangible Assets [Line Items]            
Indefinite-lived intangible assets         $ 13,500,000