Significant Accounting Policies - Summary of Changes in the Allowance for Doubtful Accounts (Detail) (Allowance for Doubtful Accounts [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance, beginning of period	$ 2,818	$ 5,370	$ 5,184
Charges (recoveries) to earnings	1,485	(1,050)	909
Write-offs, net of recoveries and other adjustments	(1,003)	(1,502)	(723)
Balance, end of period	$ 3,300	$ 2,818	$ 5,370