Recently Adopted Accounting Standard - Schedule of Previously Reported Quarterly Data (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for income taxes	$ 13,747	$ 12,737
Net income	$ 27,949	$ 23,706
Basic net income per share	$ 0.95	$ 0.80
Diluted net income per share	$ 0.95	$ 0.79
Diluted weighted average common shares outstanding	29,561,406	29,910,292
Cash flows from operating activities	$ (86,444)	$ (84,120)
Cash flows from financing activities	$ 73,859	80,119
As Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Provision for income taxes		13,041
Net income		$ 23,402
Basic net income per share		$ 0.79
Diluted net income per share		$ 0.78
Diluted weighted average common shares outstanding		29,860,730
Cash flows from operating activities		$ (84,483)
Cash flows from financing activities		$ 80,482