Stock-Based Compensation - Summary of Outstanding Stock Options by Exercise Price Range (Detail)	12 Months Ended
	Dec. 31, 2015 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	1,191,125
Weighted- Average Remaining Contractual Life (in years)	4 years 3 months
Weighted- Average Exercise Price (in dollars per share)	$ 10.48
Number of Options (in shares) | shares	1,191,125
Weighted- Average Exercise Price (in dollars per share)	$ 10.48
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	2.44
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 27.57
$ 2.44 - $ 2.75
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	126,000
Weighted- Average Remaining Contractual Life (in years)	9 years 5 months
Weighted- Average Exercise Price (in dollars per share)	$ 2.44
Number of Options (in shares) | shares	126,000
Weighted- Average Exercise Price (in dollars per share)	$ 2.44
$ 2.44 - $ 2.75 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	2.44
$ 2.44 - $ 2.75 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 2.75
$ 2.76 - $ 5.50
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	294,500
Weighted- Average Remaining Contractual Life (in years)	6 years 8 months
Weighted- Average Exercise Price (in dollars per share)	$ 4.56
Number of Options (in shares) | shares	294,500
Weighted- Average Exercise Price (in dollars per share)	$ 4.56
$ 2.76 - $ 5.50 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	2.76
$ 2.76 - $ 5.50 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 5.50
$ 5.51 - $ 8.26
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	100,000
Weighted- Average Remaining Contractual Life (in years)	4 years 9 months
Weighted- Average Exercise Price (in dollars per share)	$ 7.33
Number of Options (in shares) | shares	100,000
Weighted- Average Exercise Price (in dollars per share)	$ 7.33
$ 5.51 - $ 8.26 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	5.51
$ 5.51 - $ 8.26 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 8.26
$ 8.27 - $11.02
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	368,750
Weighted- Average Remaining Contractual Life (in years)	3 years
Weighted- Average Exercise Price (in dollars per share)	$ 10.04
Number of Options (in shares) | shares	368,750
Weighted- Average Exercise Price (in dollars per share)	$ 10.04
$ 8.27 - $11.02 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	8.27
$ 8.27 - $11.02 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 11.02
$11.03 - $13.77
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	10,000
Weighted- Average Remaining Contractual Life (in years)	2 months
Weighted- Average Exercise Price (in dollars per share)	$ 11.40
Number of Options (in shares) | shares	10,000
Weighted- Average Exercise Price (in dollars per share)	$ 11.40
$11.03 - $13.77 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	11.03
$11.03 - $13.77 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 13.77
$13.78 - $16.53
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	71,000
Weighted- Average Remaining Contractual Life (in years)	1 year 1 month
Weighted- Average Exercise Price (in dollars per share)	$ 15.79
Number of Options (in shares) | shares	71,000
Weighted- Average Exercise Price (in dollars per share)	$ 15.79
$13.78 - $16.53 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	13.78
$13.78 - $16.53 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 16.53
$16.54 - $19.29
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	41,250
Weighted- Average Remaining Contractual Life (in years)	1 year 1 month
Weighted- Average Exercise Price (in dollars per share)	$ 17.82
Number of Options (in shares) | shares	41,250
Weighted- Average Exercise Price (in dollars per share)	$ 17.82
$16.54 - $19.29 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	16.54
$16.54 - $19.29 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 19.29
$19.30 - $22.05
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	0
Weighted- Average Exercise Price (in dollars per share)	$ 0.00
Number of Options (in shares) | shares	0
Weighted- Average Exercise Price (in dollars per share)	$ 0.00
$19.30 - $22.05 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	19.30
$19.30 - $22.05 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 22.05
$22.06 - $24.80
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	76,625
Weighted- Average Remaining Contractual Life (in years)	1 year 8 months
Weighted- Average Exercise Price (in dollars per share)	$ 22.89
Number of Options (in shares) | shares	76,625
Weighted- Average Exercise Price (in dollars per share)	$ 22.89
$22.06 - $24.80 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	22.06
$22.06 - $24.80 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 24.80
$24.81 - $27.57
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options (in shares) | shares	103,000
Weighted- Average Remaining Contractual Life (in years)	1 year 1 month
Weighted- Average Exercise Price (in dollars per share)	$ 25.88
Number of Options (in shares) | shares	103,000
Weighted- Average Exercise Price (in dollars per share)	$ 25.88
$24.81 - $27.57 | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	24.81
$24.81 - $27.57 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of Exercise Prices (in dollars per share)	$ 27.57