Stock-Based Compensation (Detail) (USD $) Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Percentage of shares that may be issued or reserve for awards to participants as a percentage of outstanding shares calculated on a diluted basis	12.50%
Number of shares available for grant	637
Unrecognized compensation cost	$ 3,196,000
Share-based compensation expense	424,000	329,000
Stock Options [Member]
Award vesting period	10 years
Award service period (in years)	4 years
Stock Options [Member] | Second Anniversary of Award Date [Member]
Percent of options vesting	50.00%
Stock Options [Member] | Third Anniversary of Award Date [Member]
Percent of options vesting	25.00%
Stock Options [Member] | Fourth Anniversary of Award Date [Member]
Percent of options vesting	25.00%
Non-Vested Stock Options [Member]
Unrecognized compensation cost	13
Restricted Stock Units (RSUs) [Member]
Unrecognized compensation cost	$ 3,183
Award vesting period	3 years
Unrecognized compensation cost, period of recognition	2 years 2 months 9 days
Restricted Stock Units (RSUs) [Member] | Second Anniversary of Award Date [Member]
Peer company review period (in years)	2 years
Percentage of restricted stock units vesting	67.00%
Restricted Stock Units (RSUs) [Member] | Third Anniversary of Award Date [Member]
Percentage of restricted stock units vesting	33.00%
Restricted Stock Units TSR [Member] | Second Anniversary of Award Date [Member]
Peer company review period (in years)	2 years
Percentage of restricted stock units vesting	67.00%
Restricted Stock Units TSR [Member] | Third Anniversary of Award Date [Member]
Percentage of restricted stock units vesting	33.00%