Shareholders' Equity - Summary of Shares of Common Stock Reserved for Future Issuance under Plans (Detail)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Common Stock Number Of Shares Par Value And Other Disclosures [Abstract]
Stock options outstanding	1,515,621	1,539,618	1,939,475
Restricted stock units outstanding	187,382	236,513
Stock options available for future grant	1,024,941	1,157,149
Common stock reserved for future issuance	2,727,944	2,933,280