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Stock-Based Compensation - Summary of Restricted Stock Units (Detail)
 12 Months Ended
Dec. 31, 2015
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-Vested Shares, Beginning Balance (in shares) | shares 1,102,281
Non-Vested Shares, Awarded (in shares) | shares 712,666
Non-Vested Shares, Vested (in shares) | shares (430,813)
Non-Vested Shares, Cancelled/forfeited (in shares) | shares (79,863)
Non-Vested Shares, Ending Balance (in shares) | shares 1,304,271
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]  
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share) | $ / shares $ 35.60
Weighted Average Grant Date Fair Value, Awarded (in dollars per share) | $ / shares 42.21
Weighted Average Grant Date Fair Value, Vested (in dollars per share) | $ / shares 35.90
Weighted Average Grant Date Fair Value, Cancelled/forfeited (in dollars per share) | $ / shares 42.22
Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) | $ / shares $ 38.71