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Stock-based Compensation - Stock Options Fair Value Assumptions (Detail) - Jun. 30, 2015 - $ / shares
Total
March 2015 Grant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant date price per share of stock option award $ 17.57
Expected dividend yield per share 3.40%
Expected life in years 5 years 9 months
Expected volatility 42.27%
Risk-free interest rate 1.73%
Grant date fair value per share of option awards $ 5.20
February 2014 Grant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant date price per share of stock option award $ 37.93
Expected dividend yield per share 2.75%
Expected life in years 6 years 6 months
Expected volatility 52.14%
Risk-free interest rate 1.98%
Grant date fair value per share of option awards $ 15.26
February 2013 Grant [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant date price per share of stock option award $ 42.76
Expected dividend yield per share 2.75%
Expected life in years 6 years 6 months
Expected volatility 53.77%
Risk-free interest rate 1.29%
Grant date fair value per share of option awards $ 17.28