Summary of Significant Accounting Policies - Weighted Average Shares and Share Equivalents Used to Calculate Basic and Diluted Earnings Per Share (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Weighted average number of shares outstanding used to calculate basic EPS	4,737,124	5,011,058	5,469,159
Dilutive securities:
Stock options and restricted share units	124,578	130,471	154,658
Weighted average number of shares and share equivalents outstanding used to calculate diluted EPS	4,861,702	5,141,529	5,623,817