Stock-Based Compensation - Summary of Changes in Number of Shares of Restricted Stock and Restricted Stock Units (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Shares outstanding, beginning of period (in shares) | shares	497
Granted (in shares) | shares	131
Vested (in shares) | shares	(227)
Canceled (in shares) | shares	(42)
Shares outstanding, end of period (in shares) | shares	359
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 of period (in dollars per share) | $ / shares	$ 149.40
Weighted average grant date fair value, granted (in dollars per share) | $ / shares	126.31
Weighted average grant date fair value, vested (in dollars per share) | $ / shares	151.68
Weighted average grant date fair value, canceled (in dollars per share) | $ / shares	145.56
Weighted average grant date fair value, end of period (in dollars per share) | $ / shares	$ 142.48