Equity and Changes in Equity During Period (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Stockholders Equity [Line Items]
Balance at beginning of period	$ 557,375
Net income	4,353	1,256
Currency translation	49	(224)
Change in fair value of redeemable common stock	(16,535)
Stock-based compensation	2,403
Stock option exercises, net of withholdings and other	1,368
Common stock repurchases	(810)
Balance at end of period	548,203
Pro Forma
Stockholders Equity [Line Items]
Balance at beginning of period	557,375
Net income	4,353
Currency translation	49
Termination of put rights of redeemable common stock in connection with the IPO	34,950
Issuance of common stock in connection with the IPO, net of issuance costs	95,461
Change in fair value of redeemable common stock	(16,535)
Stock-based compensation	2,403
Stock option exercises, net of withholdings and other	1,368
Common stock repurchases	(810)
Balance at end of period	$ 678,614