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Share-Based Compensation - Summary of Activity Related to Restricted Stock Granted under Incentive Plan (Detail) - 6 months ended Jun. 30, 2015 - Restricted Stock Grants [Member] - $ / shares
shares in Thousands
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Total Shares, Outstanding, Beginning Balance 1,033
Total Shares, Granted 324
Total Shares, Vested (270)
Total Shares, Forfeited, canceled or expired (10)
Total Shares, Outstanding, Ending Balance 1,077
Weighted Average Grant Date Fair Value, Beginning Balance $ 28.75
Weighted Average Grant Date Fair Value, Granted 45.66
Weighted Average Grant Date Fair Value, Vested 26.92
Weighted Average Grant Date Fair Value, Forfeited, cancelled or expired 27.88
Weighted Average Grant Date Fair Value, Ending Balance $ 34.30